Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8e69b2ab964c87…

MALICIOUS

PDF

73.6 KB Created: 2021-01-23 20:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ba9bf266db3ee19f705d136670216556 SHA-1: 0a409ef8d19c2c0edcffa3fc539d01beb9f3dc35 SHA-256: ec8e69b2ab964c87f08ad38b3725ff73ef1737f403d9a86c48528cc7df61d62d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to drive traffic to malicious websites, potentially for credential harvesting or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=city+siege+4+hacked+unlimited+money+unblocked PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367642/normal_6006ac488cff3.pdfIn PDF document text
    • https://wenezobu.weebly.com/uploads/1/3/4/6/134625155/ca1900fcb6.pdfIn PDF document text
    • https://wobosiwax.weebly.com/uploads/1/3/1/6/131607505/luwazuzekoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365567/normal_5feee20f3a0d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454299/normal_5fcda8be23287.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466367/normal_5fc812273deb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374024/normal_5fec4a1d890e0.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/2955cfde3e08d43.pdfIn PDF document text
    • https://busejupeguwija.weebly.com/uploads/1/3/0/7/130740624/kajeruzagivobuzifi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417221/normal_5ff5516682afb.pdfIn PDF document text
    • https://tugoxalimirufa.weebly.com/uploads/1/3/4/3/134310877/7950618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443292/normal_5ffe72bbe5bec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414175/normal_5ff8d68321dfe.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/zemunomipazikez/favusubopej.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/twitter_app_latest_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/hypixel_skyblock_minion_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/identifying_rational_and_irrational_numbers_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/pogojukuzeji.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/nelixerarorozikarakedod.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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 5556 bytes
SHA-256: 80760d0b0fc8eeb3df31e474a1291dbc1fa2975b18ee215487efd4546fd20b32
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 11376 bytes
SHA-256: d05a60fedbbd0a66a9c4363c9b12768e766a5158a9a43dbd2f72527978f8f31b

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