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)
MD5: 9fb756d473ca66fc4d60020bb40f9e8c SHA-1: 511ef732a13da26efcd3a612ca8f156c9a8ebfb5 SHA-256: becd155903716ddd6780b8e23b6f21ade22c0ca9c8569ece24c0edf2b3585894
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are SEO-themed and point to other PDF documents, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
    • https://cdn-cms.f-static.net/uploads/4460975/normal_601c5bacc9725.pdf
    • https://cdn-cms.f-static.net/uploads/4462727/normal_60176bc9ca5f6.pdf
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fccf73740e9a.pdf
    • http://rirelavemug.iblogger.org/motorcycle_keihin_carburetor_tuning.pdf
    • http://kogutojoveso.mywebcommunity.org/8664708668.pdf
    • https://cdn-cms.f-static.net/uploads/4421770/normal_603709e56f8c0.pdf
    • https://nixabuvibowigev.weebly.com/uploads/1/3/4/3/134308208/1642021.pdf
    • https://cdn-cms.f-static.net/uploads/4449630/normal_5fdc08da68851.pdf
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/941a1361a220a0.pdf
    • http://dojemop.mywebcommunity.org/adding_worksheets_for_kindergarten.pdf
    • https://cdn-cms.f-static.net/uploads/4388165/normal_60404551ac269.pdf
    • https://monivewuvafa.weebly.com/uploads/1/3/4/0/134096064/kofego_bobetedagisatev_zaponogo.pdf
    • http://mibemuxagegija.mywebcommunity.org/bazozose.pdf
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fd662bb01826.pdf
    • https://nobawevedidilut.weebly.com/uploads/1/3/1/3/131379382/rixoxuj-jolepogixa.pdf
    • https://ruxakadun.weebly.com/uploads/1/3/0/7/130739963/lexoxeni.pdf
    • http://dogalijun.scienceontheweb.net/why_is_there_a_jumper_wire_on_my_thermostat.pdf
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6015f32a8c4c0.pdf
    • https://cdn-cms.f-static.net/uploads/4388626/normal_603faf5c1e481.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/7f70b07f-a5fa-417f-87be-97e9e1458243/yamaha_rx-v463_receiver_review.pdf
    • https://uploads.strikinglycdn.com/files/83c17859-333f-47eb-b322-3fa8007ebfee/what_are_the_different_types_of_abbreviations.pdf
    • http://gozenabuzixi.onlinewebshop.net/nigotukepuzazebarologoto.pdf
    • https://uploads.strikinglycdn.com/files/22934cee-a59d-43cb-8a49-bc6625b9e9f6/jewotusogasatiwala.pdf
    • http://jobisazukom.rf.gd/andres_manuel_lopez_obrador_biografia.pdf
    • https://uploads.strikinglycdn.com/files/ccdad6eb-ed0d-4578-8e7c-01bfb33e5539/saxon_math_course_2_cumulative_test_10a.pdf
    • https://uploads.strikinglycdn.com/files/c3700278-bfb7-40c5-8f38-5b132fc7b0bd/who_pays_for_obamacare_subsidies.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

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

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