Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dbfb82a7779dcf…

MALICIOUS

PDF

79.2 KB Created: 2021-02-27 09:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 68f4210a9e856d3e32803c5a1f74f96b SHA-1: 17618c88735a03355a5f272d9b6d040d49cd053a SHA-256: 87dbfb82a7779dcfe7a82a48d6109a0df2197609b11dad03e31fb4ae97e2cdb4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://botokaw.ru/123?utm_term=envy+4500+not+printer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478655/normal_60116fc55a43f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478383/normal_6033802d91d8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420238/normal_6021bc8b47f03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427097/normal_5ff4cf019d35b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_600b72bfb975f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403404/normal_5ff0dfcf6132f.pdfIn PDF document text
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/3848419.pdfIn PDF document text
    • http://gokutasajegeraj.22web.org/pennsylvania_mandated_reporter_elder_abuse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375203/normal_5fecf5b31b155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_60185297d19e8.pdfIn PDF document text
    • http://votilabelomebom.iblogger.org/coroners_act_reportable_death.pdfIn PDF document text
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/depuziwabifufekux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5ffae7b5cd770.pdfIn PDF document text
    • http://newberginvestmentproperty.com/will_there_be_any_more_kane_chronicles_booksc6ie9.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://komomikadexep.rf.gd/gonareremubaran.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 4652 bytes
SHA-256: 117b0e4a9b0dd8210959c12568f0dc9c83846a311bdd12730e87e92c11a601dc
font_01_sfnt_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 10880 bytes
SHA-256: dec2f7c7a36125931f9bf9eec074438de521338a6a792d15ade63bce8ebb86ac
font_02_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off0001213b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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