Malicious PDF — malware analysis report

Static analysis result for SHA-256 381c000c26466b42…

MALICIOUS

PDF

60.0 KB Created: 2020-12-22 16:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 733a1d88ff5c6e461725db541dbd9688 SHA-1: 763b1737fff3f97319d86bd411851872160c3db9 SHA-256: 381c000c26466b42f2d0a335a851437b06a3f1652d109fc99b2fbb1b37a1ac15
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used to create link farms for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://trafficel.ru/strik?utm_term=the+farm+movie+watch+online+free
    • https://jubamojeke.weebly.com/uploads/1/3/4/4/134432472/7eb8609.pdf
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/xevenezegoja.pdf
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/07f3bf6e894be.pdf
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/mavami.pdf
    • https://kisigitoteke.weebly.com/uploads/1/3/3/9/133997396/govin.pdf
    • https://cdn-cms.f-static.net/uploads/4406793/normal_5fbc9fc57d5dc.pdf
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/sikedid_susugexa_digiladukoxofeb_turuzavizojefu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xovekolamoxe/solamente_una_vez_violin_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/133948b4-be60-4748-ba2c-2fc06c5015be/degufojugidadimumutufev.pdf
    • https://uploads.strikinglycdn.com/files/a1f191e3-c4d2-4642-a47d-733dd7472083/nuwubuforo.pdf
    • https://uploads.strikinglycdn.com/files/447ad5fe-47f7-4f06-b88c-8b1e288413aa/jordan_baker_great_gatsby_personality.pdf
    • https://uploads.strikinglycdn.com/files/7f960e14-f80f-4d6e-8d61-1ed8f67503d6/liquid_glass_auto_polish.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_off0000b19f.bin
f82bf21eea48ab1eee408f025e8fb97f33d7029855c1f831affd9bf23ad0e877
pdf-font-stream PDF embedded font (sfnt) at offset 0xB19F 5044 bytes
font_01_sfnt_off0000c2b2.bin
838c5d7a858442818f61e47273f44288732a527c13237ba2304f5c3fd0efeda5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B2 9680 bytes