Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50fae08acdbb033…

MALICIOUS

PDF

77.3 KB Created: 2021-04-04 15:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d2478531066c38a9751e675961e97acb SHA-1: 270763adc4560cf42a9b7f2a5b557f5aa4ee6553 SHA-256: c50fae08acdbb033a41650ba6a352db88af68263cba6dd35b493d867b3c16ed9
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/strik?utm_term=wf+2630+epson+cartouche PDF link annotation
    • http://normab-id.com/87161772418u5f82.pdfIn PDF document text
    • http://draiwenstore.online/3762877668r4xcx.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/momujak.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/3531371.pdfIn PDF document text
    • http://logmeinnow.xyz/nijogifopivehd2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_5fe785e750e38.pdfIn PDF document text
    • https://dumuwikodopod.weebly.com/uploads/1/3/4/4/134458554/7042566.pdfIn PDF document text
    • http://fastpeysistem.online/298034869091h8tp.pdfIn PDF document text
    • http://trujillostacoshop.com/electrolux_washer_efls627uttv0dee.pdfIn PDF document text
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/875352.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/katajomilikuw.pdfIn PDF document text
    • http://naykaryadom.fun/127004295172nsch.pdfIn PDF document text
    • https://pasugewu.weebly.com/uploads/1/3/1/0/131071180/1812748.pdfIn PDF document text
    • http://letgtma.bid/choices__connections_an_introduction_to_communication_2nd_edition4dmdg.pdfIn PDF document text
    • http://amsidisi.xyz/samsung_smart_tv_bluetooth_keyboard_and_mousebpm54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418175/normal_5ffb17b55f383.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/6f8f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_600ef8047bc75.pdfIn PDF document text
    • https://botapafejerevim.weebly.com/uploads/1/3/5/3/135317081/wojorosevaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/416541cd-c053-45c9-8979-9aa6f0a7c550/puwagifuvenijimuzela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc3b50e2-2c02-4edf-bd19-1e55845112ed/guvuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909b454b-0122-4507-9b3b-509ac0aff350/rumifure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/676f7169-9d96-4593-be4a-0c33d827b540/luzonemizukisibefaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7860291f-1400-455b-8fcd-102db4a79413/68366125128.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_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 5676 bytes
SHA-256: f9c38d3e399aa632a8660bfdbf8f4646b07a3b128dc6875a41449550d3b300f1
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 11868 bytes
SHA-256: b92143f846c4eb13f18409c523a57fb7ce8494cf7df6f612edb89a80d3c44475