Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b12cfa99857440a…

MALICIOUS

PDF

78.9 KB Created: 2020-11-18 03:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e0ab53afa0b9c8f846b50f186e5ec1d9 SHA-1: 52f46b2c500d35f85e3988bc6fcbc6cd7c12eea8 SHA-256: 0b12cfa99857440ae2afae7c3d85a0bdff6ddd42cf62319f6ec083903275b044
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical finding for a link farm and ClamAV detection as a phishing trojan. The presence of numerous external URIs, particularly those hosted on traffset.ru and cdn-cms.f-static.net, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=living+environment+regents+curve+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388839/normal_5f9781884628d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_5fa9aedf2764c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5f8ba18ee4ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5f8e8f1005c44.pdfIn PDF document text
    • https://wogivanozo.weebly.com/uploads/1/3/4/5/134586267/7945529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dofufiri/carry_on_jatta_punjabi_movie_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/nadasox.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/latest_banking_awareness_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/5009462835.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 5152 bytes
SHA-256: 5ea7fe53fe7936878d848dde268344ff244f5025a3f5f1aca46d83778414cc38
font_01_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 11264 bytes
SHA-256: b02a56f47c8bb303f6e1bf0b6a5e34999eeba3eca50dcd78c403e099b3ec86a8