Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9cf2ea132bb821…

MALICIOUS

PDF

74.7 KB Created: 2020-12-18 11:35:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d7ff5c3fee5637c933222118f5fc064e SHA-1: 5ac0b7cc03dbead6d6142ccb1d83e1642da06f78 SHA-256: ed9cf2ea132bb82196888960872025a03b6bc3590b54be2f8120ba2949a31e54
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing sites, with one prominent URL pointing to 'traffset.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=effective+interpersonal+skills+interview+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5faebf4017db0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_5fdc46b7e5bc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460983/normal_5fc32b93632c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5fc87067662f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_5fbe1883eab6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448332/normal_5fc998ed116e8.pdfIn PDF document text
    • https://kezodedekupamo.weebly.com/uploads/1/3/4/6/134605888/5677074.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc7b3865fa98a681f101f83/t/5fc93d034341ba71633cacd6/1607023875808/dafewim.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/idolmaster_cinderella_starlight_stage_event_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/importance_of_ethnology.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe6cbf3f75b16643a6c264/1606315200001/dd_airship_rules.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b7a28b9e860b7b22cdad/t/5fcb0f3921c0486e918e4aa1/1607143225425/puseserowonupepuvijawoju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 5328 bytes
SHA-256: 11c6905e92ad16befa90aa8ee7631a79aa9a6f3f09f0cb1a7dba81602154030e
font_01_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 10544 bytes
SHA-256: 04c12dacbcddf950b8d0f01db4dff5b04de3eb26df6e3b1cc1da8fb706cec287
font_02_sfnt_off00010f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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