Malicious PDF — malware analysis report

Static analysis result for SHA-256 becd155903716ddd…

MALICIOUS

PDF

114.5 KB Created: 2021-03-12 10:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9fb756d473ca66fc4d60020bb40f9e8c SHA-1: 511ef732a13da26efcd3a612ca8f156c9a8ebfb5 SHA-256: becd155903716ddd6780b8e23b6f21ade22c0ca9c8569ece24c0edf2b3585894
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/award?keyword=assamese+alphabet+chart+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460975/normal_601c5bacc9725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462727/normal_60176bc9ca5f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fccf73740e9a.pdfIn PDF document text
    • http://rirelavemug.iblogger.org/motorcycle_keihin_carburetor_tuning.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/8664708668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_603709e56f8c0.pdfIn PDF document text
    • https://nixabuvibowigev.weebly.com/uploads/1/3/4/3/134308208/1642021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449630/normal_5fdc08da68851.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/941a1361a220a0.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/adding_worksheets_for_kindergarten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_60404551ac269.pdfIn PDF document text
    • https://monivewuvafa.weebly.com/uploads/1/3/4/0/134096064/kofego_bobetedagisatev_zaponogo.pdfIn PDF document text
    • http://mibemuxagegija.mywebcommunity.org/bazozose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fd662bb01826.pdfIn PDF document text
    • https://nobawevedidilut.weebly.com/uploads/1/3/1/3/131379382/rixoxuj-jolepogixa.pdfIn PDF document text
    • https://ruxakadun.weebly.com/uploads/1/3/0/7/130739963/lexoxeni.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/why_is_there_a_jumper_wire_on_my_thermostat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6015f32a8c4c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388626/normal_603faf5c1e481.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f70b07f-a5fa-417f-87be-97e9e1458243/yamaha_rx-v463_receiver_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c17859-333f-47eb-b322-3fa8007ebfee/what_are_the_different_types_of_abbreviations.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/nigotukepuzazebarologoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22934cee-a59d-43cb-8a49-bc6625b9e9f6/jewotusogasatiwala.pdfIn PDF document text
    • http://jobisazukom.rf.gd/andres_manuel_lopez_obrador_biografia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccdad6eb-ed0d-4578-8e7c-01bfb33e5539/saxon_math_course_2_cumulative_test_10a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3700278-bfb7-40c5-8f38-5b132fc7b0bd/who_pays_for_obamacare_subsidies.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 5524 bytes
SHA-256: 5812a12cd7dfcd3f17c2ff976dd880e42795f698116358f8bc2cb2620f800f82
font_01_sfnt_off00013526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13526 15584 bytes
SHA-256: 67e30822e917c5a8abc467d2d14a8bdbe476deca4d7d82f6955dd19a0572afa2
font_02_sfnt_off000162f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F7 19568 bytes
SHA-256: b247e20d16c40d21552ae7502f7f9c9e70ad8dc79c1c3ffde84e12439c5103dd
font_03_sfnt_off00019ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AB6 16116 bytes
SHA-256: 6fffb1aeb89666cbcaec4ce24454e19e9ad5757041bd2745d7057949fb60916b
font_04_sfnt_off0001afcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFCB 2280 bytes
SHA-256: 7fa29618c429229b2fc769676adc85ce8817e0f26e0529d93e0d0d072e2fce90