Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a5360a113fec93…

MALICIOUS

PDF

75.4 KB Created: 2021-03-20 08:31:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 298f7be95b000e96f485d73e1eec7846 SHA-1: c16b21238dd56f4421b1d42dd8ac9c2b9efd0280 SHA-256: 19a5360a113fec93bce3bd432a79166565a6018519ddddd3d59b17fa90d8425c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. The embedded URLs likely serve as the primary mechanism for distributing further malicious content or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=graco+duoglider+double+stroller+collapse PDF link annotation
    • https://teduruperalugo.weebly.com/uploads/1/3/4/3/134320262/weguwajuzev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5ff543912d85f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417656/normal_5ff008ee36068.pdfIn PDF document text
    • http://daxepekudinis.iblogger.org/70629715338.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/when_should_honda_pilot_timing_belt_be_replaced.pdfIn PDF document text
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/6742924.pdfIn PDF document text
    • https://pomorewosijimop.weebly.com/uploads/1/3/2/6/132681296/ceb27e10cd2498.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/6721814.pdfIn PDF document text
    • https://kunewosixur.weebly.com/uploads/1/3/4/3/134393142/a90e3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_600be4e711d32.pdfIn PDF document text
    • https://semanipiji.weebly.com/uploads/1/3/5/3/135312460/bozovuf.pdfIn PDF document text
    • https://zopivorideruv.weebly.com/uploads/1/3/3/9/133997575/8351913.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/8c32e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484821/normal_605261a82ed2a.pdfIn PDF document text
    • http://beruvutekimeged.22web.org/41195413084.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_f10951218be54ad5b7ad81bdbf44f437.pdf?index=trueIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_f38df7223a714cb188199ab21e1f622f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e69029-db58-49d8-a2c7-f06b2e2ef67d/99103591854.pdfIn PDF document text
    • http://tixelupaninaber.rf.gd/30th_birthday_party_checklist.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_2a8d452ceb304caeaca2150c75f00f60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f125df61-31a6-4429-80c2-e6710a7519fb/dozigefanul.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_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 5412 bytes
SHA-256: 78f6f170d1d78ed13104b5b5f635e3640cbda9eedae068c75aa7b7ff3a62f455
font_01_sfnt_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 11248 bytes
SHA-256: 9605582bd9e7940d6d98a2a20a0d38898acaf5a75a06efad8dbb62fa6875e91d