Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a356e7654fbce7b…

MALICIOUS

PDF

73.0 KB Created: 2020-12-20 07:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b9439fee6bd01a2e441a5cd835b8015 SHA-1: d1b5a0dc98da7ce4b632748f078c296d127d7fcc SHA-256: 0a356e7654fbce7b6f7ef492c44d1782a6dafe69336fbaaf6c0d5d76bf369d02
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with one prominent URL pointing to 'traffine.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/strik?utm_term=oral+b+smart+guide+time+setting
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5f9ac8d14c453.pdf
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5fd646b67c4df.pdf
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/cff1088e88a31.pdf
    • https://getezulesu.weebly.com/uploads/1/3/1/0/131071231/besoz.pdf
    • https://static.s123-cdn-static.com/uploads/4499653/normal_5fca6837753aa.pdf
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/bilanekatetoteg.pdf
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/dajaz-basabufuwef-nejewedusunober-wujajap.pdf
    • https://cdn-cms.f-static.net/uploads/4419205/normal_5fd11e2bd9a58.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/legenapi/84868950991.pdf
    • https://s3.amazonaws.com/vetamedisoz/ruvutuforuzabumikosowulo.pdf
    • https://s3.amazonaws.com/pafiganovavi/biological_safety_cabinet_adalah.pdf
    • https://uploads.strikinglycdn.com/files/19b6ff76-4fa4-4e3e-b8c3-49453e312e21/brown_eyed_girl_sheet_music.pdf
    • https://s3.amazonaws.com/vexosafugunu/91221124728.pdf
    • https://s3.amazonaws.com/laradusa/poemas_cortos_de_amor.pdf
    • https://s3.amazonaws.com/medaliwifufugel/nijugagudaxuw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d741.bin
7bfa39d453326f38a565c452d398c6a3c3d43a6ee15b4d7be2ea2007b9d70d33
pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 5312 bytes
font_01_sfnt_off0000e926.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 1800 bytes
font_02_sfnt_off0000f1b4.bin
4996c6a69b3d43b7b84885af1b0ab29d857b16ab32e300b6f780690c7c35c3d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10752 bytes