Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9b2b8a1e7242dd…

MALICIOUS

PDF

72.5 KB Created: 2021-05-30 19:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 100e9865040d50a98c1d0374d1df1ad3 SHA-1: 64dc3bd07fe161b724bdf2d25c3ec91e4311c1a5 SHA-256: 0f9b2b8a1e7242ddafec6f392673c97a3eb299cf413406fd4bd0e3a3e8b0a4ed
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. ClamAV and an ML classifier also flagged the file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://static.s123-cdn-static.com/uploads/4527357/normal_5ff64d25d23ca.pdf
    • https://cdn-cms.f-static.net/uploads/4481675/normal_5fd6ac589febf.pdf
    • https://static.s123-cdn-static.com/uploads/4426415/normal_5fe0b3f4e9352.pdf
    • https://cdn-cms.f-static.net/uploads/4371814/normal_603fe86479bc1.pdf
    • https://static.s123-cdn-static.com/uploads/4423133/normal_5ff95fbededae.pdf
    • https://cdn-cms.f-static.net/uploads/4447278/normal_60546fb14e280.pdf
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/kizunako_zewigegajojal.pdf
    • https://static.s123-cdn-static.com/uploads/4415073/normal_5fe2c4b5bcde9.pdf
    • https://cdn-cms.f-static.net/uploads/4425010/normal_6009cd4407f07.pdf
    • https://static.s123-cdn-static.com/uploads/4490534/normal_5fe4950db6777.pdf
    • https://cdn-cms.f-static.net/uploads/4480383/normal_6043561e04492.pdf
    • https://static.s123-cdn-static.com/uploads/4373241/normal_5fecce0887206.pdf
    • https://mesubepivugegej.weebly.com/uploads/1/3/2/6/132682347/7201b6d8c.pdf
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/8fd615b4.pdf
    • https://cdn-cms.f-static.net/uploads/4485800/normal_60209023c3d64.pdf
    • https://cdn-cms.f-static.net/uploads/4406516/normal_60374c2bf02b4.pdf
    • https://cdn-cms.f-static.net/uploads/4461744/normal_6014e3f589ad6.pdf
    • https://static.s123-cdn-static-d.com/uploads/4420756/normal_60affab90b990.pdf
    • https://zodazapel.weebly.com/uploads/1/3/4/5/134511258/renekexodod.pdf
    • https://fotavisemaro.weebly.com/uploads/1/3/1/4/131406710/xativitevimasunofavi.pdf
    • https://bokasaveti.weebly.com/uploads/1/3/4/7/134725866/nijijifokexewu-lopana-nudewo-werifiwobob.pdf
    • https://fizijoju.weebly.com/uploads/1/3/0/8/130814030/bepipugikuwa.pdf
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/3559307.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/vAIYpVcV8Aw/wb?keyword=dilations%20
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e07a.bin
473071fe2b17fc9b113def7fd1399b017f40487f723810dd1be8dca7bb45cf30
pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 5324 bytes
font_01_sfnt_off0000f2ba.bin
5025bd38bc227963aa4e3020fa0453fd69a280463c52ee7a4e1a2457630fd6a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 9708 bytes