Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb3ec6a1cfdb32b…

MALICIOUS

PDF

73.8 KB Created: 2021-02-18 14:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b63433d208dd1e669de27fb02f98cbda SHA-1: e7f1217a8c83633c39b8d4fe0f6f02765a12420b SHA-256: acb3ec6a1cfdb32b1899487993462370c5823bc95bb8bcd0caddf71a9e4fa8a6
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, many pointing to disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://maypoin.ru/wb?keyword=which%20aws%20certification%20is%20best%20for%20web%20developers', is presented as a search result, likely to trick users into clicking. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_LINK_FARM' and the sheer volume of external links indicate a malicious intent to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wb?keyword=which%20aws%20certification%20is%20best%20for%20web%20developers PDF link annotation
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/zenonudemu-tepin-nugobinujig.pdfIn PDF document text
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/1593352.pdfIn PDF document text
    • https://gipofomodofomew.weebly.com/uploads/1/3/2/3/132303323/6000307.pdfIn PDF document text
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/3970119.pdfIn PDF document text
    • https://bagetakibejo.weebly.com/uploads/1/3/1/8/131871627/6fdc0b3a60.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/3058232.pdfIn PDF document text
    • https://telogedibosujo.weebly.com/uploads/1/3/1/4/131438044/9e405ea4c36b173.pdfIn PDF document text
    • https://namowabe.weebly.com/uploads/1/3/4/0/134000139/minim_fojoluzevesuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389606/normal_5fcc842a4dcbc.pdfIn PDF document text
    • https://telidububiz.weebly.com/uploads/1/3/1/4/131452987/mowavafolano-kenavuki-kovol.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/ihUiaih/19666683463.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/8871440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/fawuvodaxenoxekejalugaw.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/nupuzawepikidegexidizom.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/9160864617.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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 5548 bytes
SHA-256: 055410f3c5d3c5c210e256c9edffbb051ccd323e65e8856a9e8dca0b3c5b14c2
font_01_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 10876 bytes
SHA-256: 500fdf0e7898698649314150a7970d7745c0167e90d87059081e76a4266cc7d0

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