Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1460d3307ab32b…

MALICIOUS

PDF

78.2 KB Created: 2021-05-27 19:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 639ee1ea11f43330d877c3018282e3a1 SHA-1: 525e85f33d0d187c997428680c7d64bb3dce4320 SHA-256: 3f1460d3307ab32b6fa9f6f94349c2ad80834e6adf53b7f198f1fe14d29ab318
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://druttle.ru/strik?utm_term=how+to+use+ifb+convection+microwave+for+baking PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450249/normal_600277844f105.pdfIn PDF document text
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/gakudu_gobowajuviwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_601a3c8776c0e.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/2b878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420612/normal_6014ce4e040f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454425/normal_606c5b8426aad.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/wanusumetuwigum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_602018bd5672c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5fedc12c1d8c7.pdfIn PDF document text
    • https://depovazopalixu.weebly.com/uploads/1/3/2/6/132681382/kogibereb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_606be1646d987.pdfIn PDF document text
    • https://kabawerabava.weebly.com/uploads/1/3/0/7/130774965/b4b80c0e98.pdfIn PDF document text
    • https://reninifovebomul.weebly.com/uploads/1/3/4/3/134361606/c0d3f16b26ba561.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375703/normal_5fd060f7e6903.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/turexigewoliwe-godudibelivapek-gogiriwotadar-loxor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393514/normal_600100ec1f4dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_5fd8930540551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_6036778b7e09a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494452/normal_5fdfad1809cf6.pdfIn PDF document text
    • https://wunobenera.weebly.com/uploads/1/3/4/8/134887230/2c4972fdad2.pdfIn PDF document text
    • https://xodomifosipux.weebly.com/uploads/1/3/4/8/134865855/votin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_601d0abc8d1b0.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/07f59b01-bc06-4000-a4b2-b4851bb93049/zajow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a07493-91e4-4080-82c1-7c6897eb5ea5/34529818034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed5bb8b-da41-4532-afe3-c24a213a950d/nidozogapu.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_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 5484 bytes
SHA-256: 04a5b51fb981957dea94ccfbc2c8d814191e9e817ba53b3630026aa840f49999
font_01_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 10464 bytes
SHA-256: e157f4b417b0a233d2c9d024bd9e777bf6f0b3ffa314cbe14cd78b71e16627f6