Malicious PDF — malware analysis report

Static analysis result for SHA-256 42df3d42844197b4…

MALICIOUS

PDF

68.2 KB Created: 2020-12-11 08:56:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36c5d17dc196269f7b70f7c6c94ba4fd SHA-1: 1e10b985b6eec1338d2bbb7c6cdbafb18cac7e74 SHA-256: 42df3d42844197b48ee6a2fdb63230fa1f1f3dff2cd93cf03520e4ef3484dc35
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm intended to direct users to external PDF documents. One such link, https://trafficel.ru/aws?utm_term=resistivity+of+nichrome+wire+lab+report, is present in the document's metadata and appears to be a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=resistivity+of+nichrome+wire+lab+report
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8db0c83bb90.pdf
    • https://jomimufigaz.weebly.com/uploads/1/3/4/3/134319247/3015368.pdf
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5fbecabd699a7.pdf
    • https://cdn-cms.f-static.net/uploads/4411717/normal_5fa921facc7d5.pdf
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5fa5f1f45e356.pdf
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5fcbb5bb9100f.pdf
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/notarenokav-pofipalolug-tepataf-zowogilawivitiz.pdf
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/jizuginotu-timuwufixawojer-fajumuxozi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vexeliku/xebibagolokufotexumeton.pdf
    • https://s3.amazonaws.com/vatosolikijike/35168927218.pdf
    • https://s3.amazonaws.com/xapidajovaji/cheats_for_beat_the_boss_2.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_off0000cd93.bin
59b8563cea6873a8b7a5814546b0a68bc28caa82be1ae1bd04f527b4595b7977
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 5656 bytes
font_01_sfnt_off0000e0c5.bin
61e2db69838e9da3a52ade2c3814880c582df1f6f044f9201ce466605df470dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 10300 bytes