Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7a9798aa3d41ac…

MALICIOUS

PDF

78.6 KB Created: 2021-05-30 05:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fb5ab58c397410187609ecf69eebc433 SHA-1: aab8dbb632fb3e049cfe3425bd6b0dab841fa401 SHA-256: bc7a9798aa3d41ac2c4888024b6b192b3352e8c5d4504fcac23c19a23e5e6bdc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by both ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and external link farm behavior are indicative of malicious document activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/123?utm_term=aisha+film+song PDF link annotation
    • https://jiwazumirinupe.weebly.com/uploads/1/3/4/3/134352382/ratujefasixuni.pdfIn PDF document text
    • https://kagafalevusina.weebly.com/uploads/1/3/4/3/134368330/nizodowunet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530171/normal_603314083a92c.pdfIn PDF document text
    • https://damafurota.weebly.com/uploads/1/3/5/3/135337485/lofusejazevaxow.pdfIn PDF document text
    • https://sewolisexuvafu.weebly.com/uploads/1/3/2/8/132815731/4303288.pdfIn PDF document text
    • https://ropesafubisok.weebly.com/uploads/1/3/4/5/134515157/e0f1ac890c25fc.pdfIn PDF document text
    • https://dezuximoloxesar.weebly.com/uploads/1/3/1/4/131410685/newobeliv.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/7835049.pdfIn PDF document text
    • https://gunajotigur.weebly.com/uploads/1/3/4/7/134738866/sasino.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468259/normal_5feb8f39464ab.pdfIn PDF document text
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/434e6123795e787.pdfIn PDF document text
    • https://xajobukemuxup.weebly.com/uploads/1/3/5/3/135398270/wotufoxodisexoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8cc76a-5a44-4425-9cfb-5a69514a3363/anatomy_for_the_artist_barcsay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d115767-bf88-45c6-a58e-10f028b082a4/does_fairy_tales_shampoo_get_rid_of_lice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2df27f-c366-42c6-9923-4d8fe2d8c53d/20435180734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c6ab71-ea7a-44ed-9b75-6d339dc29539/71315629312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb1cd32-88e8-4cf7-a16a-f47c9dd307cc/manasesuvemaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9283d602-0678-4d2b-88cf-295521d89eba/el_pollo_loco_keto_friendly_bowls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38fc31e-d372-4d01-9408-7a582b8fba7d/sopowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/420094d8-4f6a-4621-bcbc-0b188affbe30/xoxadoxotiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1dea6f-3432-48e5-84c4-ab1a00947d09/87741252651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7dc4b3-e46d-4021-bbf0-62891995b549/evan_moor_science_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e8f4ee-111b-4f8b-aa61-4cde74446dbc/japanese_grammar_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e4d9296-3fc6-4a56-a59e-f58445bb6615/84638750204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8a52a2-a141-4433-8679-eab8241b1799/voynich_manuscript_decoded_by_ai.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 5072 bytes
SHA-256: 561b01ea02b1be1553d8fd94b9973f53c9a47c955eb74eb806f60eca51aaaa8e
font_01_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 10404 bytes
SHA-256: 849ff90c10af27b87b918335a878d6948ecdef43b3127b2e382e208a0d60de4c

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