Malicious PDF — malware analysis report

Static analysis result for SHA-256 251327b4f028eb8d…

MALICIOUS

PDF

80.7 KB Created: 2021-06-07 14:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3f81fc388d5faf36febfe62f735e3a18 SHA-1: bdc52c6890ec020383b8aede222376ce73297eb9 SHA-256: 251327b4f028eb8d36ea26162bfa377a483e980cf3b52f62cf985ca960a68fbb
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/pbw?utm_term=crows+zero+2+full+movie+in+hindi+dubbed+download PDF link annotation
    • https://jidisoluko.weebly.com/uploads/1/3/6/0/136097174/0f3b2325a.pdfIn PDF document text
    • https://nepazumikad.weebly.com/uploads/1/3/5/9/135958915/vudifubiguji.pdfIn PDF document text
    • https://zajefogana.weebly.com/uploads/1/3/1/4/131407312/lolorisaxus.pdfIn PDF document text
    • https://forupubo.weebly.com/uploads/1/3/4/6/134689325/1553631.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://jizakatum.pbworks.com/f/what_movie_was_wonder_woman_in.pdfIn PDF document text
    • http://pupowivala.pbworks.com/w/file/fetch/144426813/62458200751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98baecf-9dbb-4f27-8dbb-39c609b9e504/how_long_does_domestic_priority_mail_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e756d8f-d623-46cd-9c7f-b96c6a98373a/wifisipegazimibosapubu.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/figurative_language_definition_and_examples_in_poetry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b9b0f4-05ee-4ca6-84f5-0d85fde870e6/tajug.pdfIn PDF document text
    • http://werinenimuta.pbworks.com/f/79742870109.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/xeradalimelewi.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/75044351044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaca3ebb-4f10-40be-84c4-a11e1be45efb/how_to_size_transformer_breaker.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144411978/mugurabilasasiw.pdfIn PDF document text
    • http://jukozatixul.pbworks.com/f/count_by_7s_song.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144734850/setulowibapurofiboduxere.pdfIn PDF document text
    • http://kalunagepigi.pbworks.com/f/58530727516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b4c497-28e0-4629-b587-abd365ede3f5/31229592659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5a35af-b676-4c9e-872c-18350d6e4fd7/57460935109.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144443664/nejifilejipudi.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/f/26091408175.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_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 3436 bytes
SHA-256: dcf01f2fa3cc251cfdd16bae899946ab935bf96281c265b8d9dd621402558a84
font_01_sfnt_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 5444 bytes
SHA-256: 9f2718a7d17c9bf8a04e7f25833e381a7d874b686a458b7a2e9ac50431ebc6c0
font_02_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 11748 bytes
SHA-256: 492e1dee77a9bb4fe81aadbf58fdcbd60eb094e68bc485f89ba85a40b38e057b
font_03_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34