Malicious PDF — malware analysis report

Static analysis result for SHA-256 557aeb370e259934…

MALICIOUS

PDF

57.8 KB Created: 2020-11-22 03:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e318816ee131920628b1db67e1ee21 SHA-1: d17cc0b563c13e468858513c17570997cddd14fc SHA-256: 557aeb370e2599342f0a57463ab207170434889f8781bfd9d746d1682c05670b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or link farm attacks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/123?utm_term=mathcounts+2020+first+state+round+up
    • https://cdn-cms.f-static.net/uploads/4450040/normal_5fa7957f9a548.pdf
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5f9772ca5bb69.pdf
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f948f846045e.pdf
    • https://cdn-cms.f-static.net/uploads/4452157/normal_5faa0e893c689.pdf
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5f9d57ecf088a.pdf
    • https://cdn-cms.f-static.net/uploads/4414489/normal_5f94c3d830ec6.pdf
    • https://cdn-cms.f-static.net/uploads/4451212/normal_5faf50548115e.pdf
    • https://cdn-cms.f-static.net/uploads/4426688/normal_5f99c20416a5b.pdf
    • https://cdn-cms.f-static.net/uploads/4384318/normal_5f90918dbf194.pdf
    • https://cdn-cms.f-static.net/uploads/4465924/normal_5fafdffc5e7ec.pdf
    • https://kimiragijasem.weebly.com/uploads/1/3/4/0/134096233/zorulawavujodi.pdf
    • https://cdn-cms.f-static.net/uploads/4489615/normal_5fb67eb3821ea.pdf
    • https://cdn-cms.f-static.net/uploads/4416501/normal_5f988ef6ba583.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lorerexeg/32335492804.pdf
    • https://s3.amazonaws.com/baposivarabuj/judis.pdf
    • 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_off0000a9ea.bin
192229b2fee065a39fba231cd8d1f031c31a36f0e166b7b63c50af07e43cd2bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9EA 5492 bytes
font_01_sfnt_off0000bc9e.bin
e1bc217aa159226f2250dbfb2729624a3acd3eb5b44790958dae8ecd3121819f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9E 8632 bytes