Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb413d5a24991cf7…

MALICIOUS

PDF

90.5 KB Created: 2021-04-28 20:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d0d7a2e45473a0fe028722a84b19f0e0 SHA-1: 76bcf3440f2d91bd7ffd596acea9072e6ea5061e SHA-256: cb413d5a24991cf7dc6577bff34c6b2d00e0bab5f3bded93a37c0a99f6b5677f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or to host phishing lures. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=how+to+bypass+motion+detector+light PDF link annotation
    • https://cdn.sqhk.co/vasibejovej/dqgKNhh/final_fantasy_dimensions_2_mod_apk_obb.pdfIn PDF document text
    • http://vebilodugisugod.iblogger.org/adding_sales_tax_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/bojodunaluko/ibahagL/achyutam_keshavam_krishna_damodaram_song.pdfIn PDF document text
    • https://cdn.sqhk.co/vatukaso/gfIZKhc/how_to_learn_english_faster_wikihow.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/jhTgjWI/dekuwe.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
    • https://s3.amazonaws.com/dezajok/avira_free_trial_version.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_4c9a5e572760401484cdd0f3c530f0a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7558b98f-661f-4b9c-9ecc-3dda57bb951d/40999129641.pdfIn PDF document text
    • http://widafasamuj.epizy.com/83993377785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2568f4-ebe1-4555-b127-594b448c3e91/15502363278.pdfIn PDF document text
    • http://josusasufuni.epizy.com/rejij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/360f6054-5152-46b0-ace1-78f5ea264796/80357013130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09937823-77c7-402f-8e7d-26465452c6d0/samsung_galaxy_prime_plus_price_in_tanzania.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/nosuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b2f76a-9571-4b16-b7d0-e964db837e72/pathfinder_kingmaker_valerie_romance_counter.pdfIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_f69c33c2c3654cadb71a1533a82df607.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_574a5d876fa3439f82c7a5a44c8683f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/eliciting_sounds_techniques_and_strategies_for_clinicians_ebook.pdfIn PDF document text
    • http://veroxeron.epizy.com/woxikirosenapopabutagimuj.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_b4647ae029e24dfeaab4d8faaa9dee29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c36054-f5a4-48a9-b4f4-8c23777638b8/kefoj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 5568 bytes
SHA-256: 7857baf0dbac75f6c691a8d56f9b10b030c73e115c677bf9243e060b7ed1e192
font_01_sfnt_off000125ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CE 12096 bytes
SHA-256: 541ad2ba6bd6481617f1c5812fbcd00c2f46f835d41c1c44702bf338c1ae17c7
font_02_sfnt_off00014e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E94 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34