Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a0a334684a8391…

MALICIOUS

PDF

72.0 KB Created: 2021-01-24 22:21:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b54727c4fcd08e3544be568e3fa9091a SHA-1: 7df60785d753392200e7f8d030970e2a76e67754 SHA-256: 25a0a334684a8391041b37061fa056087bf1a8e72eec7df6c269c933cce76a11
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files, many hosted on disposable domains and using URL shorteners. This behavior is indicative of a link farm or SEO spam campaign, and the ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body itself is heavily obfuscated and contains no readable content to further inform the analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=microwave+brown+rice+and+quinoa PDF link annotation
    • https://cdn.sqhk.co/rotuzuwibi/sdViitI/civil_war_1862_ios.pdfIn PDF document text
    • http://summer-italy.fun/2020_olympics_usa_skateboarding_teamz25os.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/Pghgco0/tokazubobidaxozemilosumu.pdfIn PDF document text
    • http://tazogupiwelul.iblogger.org/jamiv.pdfIn PDF document text
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/f7f66.pdfIn PDF document text
    • https://mubonunegaj.weebly.com/uploads/1/3/0/8/130874179/wuwug-vakaj-pakanosezozek-bifevu.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/jbhjhik/gudikavavexawipanigadeba.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/iiMn6cz/86463168949.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugisaxap/hixhjzP/42287158059.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/tebadabifuwig.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/1363226.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/rfihgdA/77244801712.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/gclXLjh/peburunasizupofazexopik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinejamuwaki.epizy.com/19147940444.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_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 5148 bytes
SHA-256: 200c5320d50af9825559e388e10e1ef3d3f6f7bc5e46a16c507fa4a9d3df5c2c
font_01_sfnt_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 11724 bytes
SHA-256: 2d88357825262ddf96c7f3da1c6637d3f3d82863c30c620a89b86fdce6750825

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