Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c225a9423826b99…

MALICIOUS

PDF

68.0 KB Created: 2020-11-10 12:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 035e3f554f8edb8b3d059411706812e7 SHA-1: 17cb7cf6981b2a9b55607027e6a1f3fa09d4bc79 SHA-256: 1c225a9423826b99574aa02a0e742feb6e293ccf3424d8234bf50a92c7733c63
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or SEO manipulation tactic. The embedded document body text, though corrupted, contains keywords like 'Terminator 3 cast photos' which are likely used as lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?keyword=terminator+3+cast+++photos PDF link annotation
    • https://tetobalowuw.weebly.com/uploads/1/3/4/5/134523757/3e9452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5f8dae7b28f9f.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/pivem.pdfIn PDF document text
    • https://jazakeramexevam.weebly.com/uploads/1/3/4/6/134615015/tovixosezi.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/xitefofof-dojedupomarug-januxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5f89aa7c81f50.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/f045a886.pdfIn PDF document text
    • https://patelevenimo.weebly.com/uploads/1/3/1/4/131437444/gijevab.pdfIn PDF document text
    • https://pofumojonoro.weebly.com/uploads/1/3/4/4/134474045/linimanezaned.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/bokelur/tebolawixufijepotegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4dd3228-d8a7-4103-b17b-65b32471f699/wuwawuvife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8f5918-8273-4f50-a968-17fbb8a7d94f/case_2188_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f05a9096-9cb9-4c4c-8611-ff4bb7f93ec2/zegekigemetufomemujonoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10857040-d859-4925-8462-df416a5fca9d/21859638505.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_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 5256 bytes
SHA-256: 88dabc4876f083aac662ee2a96e5c2a7d5d5c2cf26ba156cf514f761ce798073
font_01_sfnt_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 10940 bytes
SHA-256: 97d1ab5709225e85df61a001efc14031765caf1b97dd063c67915a5d3460ff46

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