Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca77df1a857ed228…

MALICIOUS

PDF

72.6 KB Created: 2020-12-21 04:11:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 218c771ea7f99bca389a1556ad690158 SHA-1: b6286f4339af0e63a3e5892275a8055f070c3f4e SHA-256: ca77df1a857ed228ceb1208971fbc0b722225a079e53fffd7e9cdab1157cf83b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical finding for a mass external PDF link farm. The ML classifier and ClamAV also identified it as malicious. The presence of numerous external links, including one pointing to 'traffset.ru', suggests a phishing or SEO spam campaign. No scripts were extracted, and the document body was heavily obfuscated.

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://traffset.ru/123?utm_term=hawaii+to+california+miles PDF link annotation
    • https://purusoze.weebly.com/uploads/1/3/4/4/134495244/valafemeroliso_xilugosu_juzimiveta_rugaliwiwarax.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/javafobuke-xiverabafat-padoxevajoso-fefosibi.pdfIn PDF document text
    • https://tefizaset.weebly.com/uploads/1/3/4/5/134587169/nugejofomitime-puriju-kepanefodi-weruxu.pdfIn PDF document text
    • https://gigalenu.weebly.com/uploads/1/3/4/6/134652901/3310339.pdfIn PDF document text
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/butebi.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/64f23e21-4f64-421e-a90b-3a59ec46e985/xeselafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d2c6a6-2b7c-4163-8baa-f16c4bd64960/panikamisafukife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66a7a70-3b25-4e0f-9421-8110ce49a8ed/84424827191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ecfc1f-b763-496b-9a23-290727d2d657/65226636500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5a6a12-864c-4747-ab4c-0235d066a0d0/chicken_tractor_wheels_diy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467a6d67-e5f9-479a-9939-5c3359b14465/dijisivojonatuwema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096ca611-199b-4b32-9d2d-c7e8c6572940/15468804854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baba70b8-9f9f-4d0d-8f34-221222db22bf/badizaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/367e5bf8-836c-4ec3-b980-115f0c3bf05a/apk_keuring_kosten.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e99a0a2757459be2ef6a/t/5fc15b289b1ed035380e983f/1606507308029/deft_wood_stains.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c3d560f2895dc1e72903/t/5fc2df294f983757203e8e32/1606606634140/osrs_blue_dragon.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_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 5080 bytes
SHA-256: e88dc95df210db3923238a18f2ecb830d055b4c3de6c3ac53cf56636527da517
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 10352 bytes
SHA-256: 86dd454617241c74da7fc992ed0d84268044ffca328339315f9f6c4f27ee3f2f

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