Malicious PDF — malware analysis report

Static analysis result for SHA-256 d645edebbe47ff0c…

MALICIOUS

PDF

91.5 KB Created: 2021-02-12 07:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4574c15469adc19be9f4d7a3c6fe48f8 SHA-1: f25ad47bae798cba4fb734533438c520854eff27 SHA-256: d645edebbe47ff0c224e2ef91fd8dc4e9cb13fd4d50dee8ac1aa287fd22dd0e3
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many of which are SEO-optimized and point to other PDFs, suggesting a link farm or phishing lure. One of the extracted URLs, 'https://maypoin.ru/wix?keyword=cisco+ip+7945+manual', is likely part of this lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing users to open a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wix?keyword=cisco+ip+7945+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383165/normal_5ffe0ef479cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_5fe7b32cb9b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_601f784c450b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407664/normal_5ff797e7d1fbc.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/f6062d44a.pdfIn PDF document text
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/02bfc.pdfIn PDF document text
    • https://jojeditisiteso.weebly.com/uploads/1/3/1/6/131606373/2684019.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/sepovutapakogaf/wakoxadafejuxudukokudap.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/66996900488.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/45493571673.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/ambarish_songs_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/juzulanikubaluwe.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/nims_700_test_questions_and_answers.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_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 5336 bytes
SHA-256: ad5cf3c10ce02a8557368e987815d82cc86d40e775c308e9354b867914db8fd6
font_01_sfnt_off00013e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E75 10296 bytes
SHA-256: 0ceaa3fb5caf955a52e3ae14aa9e968fc8dd1f1b4c650436f21988bebb41398a

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