Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b671e0117b01b6…

MALICIOUS

PDF

79.6 KB Created: 2021-05-13 12:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 47380074a1e6baff164d56790a01a5a3 SHA-1: b28449bdc96ef41a765a2de16dccd966f22a72ec SHA-256: f9b671e0117b01b6bcf51c4ef25a22e2ceac500fd8c7fe7a2e592748fdd52cd0
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to Excel statistics, directing users to malicious URLs.

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://jumiwimov.ru/strik?utm_term=how+to+use+excel+to+find+mean+median+mode PDF link annotation
    • http://sait-ok.ru/jesutitodubuvt76jr.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/bp8rKwT/galaxy_empire_evolved.pdfIn PDF document text
    • https://dazenesulamese.weebly.com/uploads/1/3/1/1/131164173/xalovemisizosunazeb.pdfIn PDF document text
    • http://infokurs.design/98221063623fy4wm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5fd322cc621d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_6014a4859a308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_5fe7b280659f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393028/normal_60035458f3336.pdfIn PDF document text
    • https://tazapupexon.weebly.com/uploads/1/3/4/6/134634001/vuruvemuxil_mekak_fediko.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/6968678.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422134/normal_5ff024edb72cf.pdfIn PDF document text
    • https://foxagizak.weebly.com/uploads/1/3/4/3/134332010/dinupufok.pdfIn PDF document text
    • https://cdn.sqhk.co/kulizuxekume/hajgzAK/96831734912.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/9b922150-f45f-4320-891f-8091e185dcca/93781243111.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_8bad2b0ac9f6497aa1158c9d192078ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75935dad-1014-4126-a4d4-133dcb874933/free_worksheets_on_idioms_for_3rd_grade.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_6128f7cfb2e04692a1d017be578417cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8299dd-bd74-4b92-bb64-9a3b6f33bc3d/nipizinatufudo.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_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 5192 bytes
SHA-256: a66dfca3f29f2e544270f7fc2843d73d35a5fb7d4ec6cf71e91b47c52c3bd7ff
font_01_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 11340 bytes
SHA-256: aaf56419fe2b2e49e5149a01ced03dcc051f558e10ed8a0bc47d152d07da58ba

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