Malicious PDF — malware analysis report

Static analysis result for SHA-256 8030143bb07a9dcf…

MALICIOUS

PDF

88.6 KB Created: 2021-03-15 00:37:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dc586d921ed8bdd2772444b95d23c5e4 SHA-1: 5e81742f436c1ccf30b43a61f880d246d5a34294 SHA-256: 8030143bb07a9dcfc7e7494a418dd99ec558b4c3fdc94bf8c75cd27b786b4e0d
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/award?keyword=bihar+daroga+mains+question+paper+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5fd330f5162a6.pdfIn PDF document text
    • http://tebafurunaxinuj.getenjoyment.net/bamevotubasixex.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/par_quoi_peut_on_remplacer_la_creme_liquide_dans_un_gateau.pdfIn PDF document text
    • http://niwujobexev.22web.org/delinquency_date_credit_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_60094551e9fbf.pdfIn PDF document text
    • http://judejoz.iblogger.org/printable_vocabulary_activities.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/952bbb6f-f626-4750-99ec-898394593be7/trials_of_apollo_book_5_free_download_weebly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34e8d1b-70cb-4c10-9fb5-5e8e0dde8788/98668560776.pdfIn PDF document text
    • http://ramejepazino.rf.gd/school_uniform_direct_mitcham.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_efb0bb2a0ff0448fb112169b609f7b3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25dee16f-20a5-4a23-9a20-c95a89e30f5f/gekoliwarag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac13e15-90c3-44df-b454-e78a33f175ee/97213881877.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/bass_guitar_notes_for_beginners.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/fluke_intellitone_pro_200_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcc0f5a-db64-4dae-809f-834ffe02d002/61836568939.pdfIn PDF document text
    • http://tizesabukabel.rf.gd/larixorero.pdfIn PDF document text
    • http://sagaxuwesik.epizy.com/roluronis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aab5a11-9913-48f0-a603-0ca2988e415b/lord_of_the_flies_sparknotes_chapter_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56483bb8-b2ac-4604-b25e-1741d899e4d4/rumble_fish_movie_free.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_7e38b9c0f98b41629c682c9ec88ca4ff.pdf?index=trueIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_32f273cbec4e434f9a37f5db96bb6566.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c87fa029-3670-4d46-80fb-677072698bda/crock_pot_digital_instructions_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf90f8f-88e9-4583-8b4a-0023779bdd42/menajak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb9993b-8fd7-4ad4-b70a-4e3f97d3622d/pivabulev.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 5480 bytes
SHA-256: d0f8c6744b1842d1d74fbf3ef37fb9a0e81d0d662a6ad049b256b79593376ba3
font_01_sfnt_off00010e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 10864 bytes
SHA-256: 45789d6c458b1a3c000bc3e587999ed1514dcb0c1bc4c37ecf455ed701dba4e8
font_02_sfnt_off00013336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13336 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
font_03_sfnt_off00014136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 4412 bytes
SHA-256: 35a3da9d142bda7b870665335c02ab5852c8586d76ddfa26ca22aee0d5525c2a