Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd16c6685c1d40d…

MALICIOUS

PDF

87.8 KB Created: 2021-06-01 18:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 19898378af467d1278587a0b92ab0168 SHA-1: 91350b1f45f87e9b7d04ffe987429b4b16771693 SHA-256: 0cd16c6685c1d40d82f8aa57b626b88f587ca78ff99175db6a8354ab339039ba
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be related to search terms, further supporting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/pbw?utm_term=mcdonald%2527s+menu+prices+uk+triple+cheeseburger PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369329/normal_5fe526ed19331.pdfIn PDF document text
    • https://kenoduzuran.weebly.com/uploads/1/3/5/3/135350653/3cebf0a9b15e80.pdfIn PDF document text
    • https://jadusozig.weebly.com/uploads/1/3/5/3/135327359/pajavije-vopixevafukire-wejiguliguxuwaf-jogutaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_603eb5c62b009.pdfIn PDF document text
    • https://selikiwomutarew.weebly.com/uploads/1/3/5/3/135329437/f696c6ef9a4.pdfIn PDF document text
    • https://fugesozuxi.weebly.com/uploads/1/3/0/7/130739141/vejoxawonagazod-nimem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_600b9b4f64fa2.pdfIn PDF document text
    • https://wigawiwamenusum.weebly.com/uploads/1/3/5/3/135323889/9615101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391907/normal_5fcedd4df301f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5ffa6108daddf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_60260f9886487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_601a86150aa8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_60132149414ed.pdfIn PDF document text
    • https://vinebikeja.weebly.com/uploads/1/3/4/7/134712271/36cbb993934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_5fd26c27651e1.pdfIn PDF document text
    • https://parimuxuroz.weebly.com/uploads/1/3/2/6/132682994/9620349.pdfIn PDF document text
    • https://kolukofutire.weebly.com/uploads/1/3/0/7/130740340/924595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_60181ca091539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427781/normal_5fe4d3293161b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473645/normal_604f373e614a0.pdfIn PDF document text
    • https://pipokusu.weebly.com/uploads/1/3/3/9/133997176/kutejoxapilawagi.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/89ec5c29-f465-4d26-9a0a-76e2773635ce/lotexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3fff392-d2df-444a-9dee-68b4203b5a58/86053774743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033b36cc-07d4-4ec1-a116-07063028e407/kosudo.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_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 5728 bytes
SHA-256: 1eca5e89966f49223cd52f42fda8e57741abe24f417dd6d83c0fba6488330b15
font_01_sfnt_off00012c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C60 10876 bytes
SHA-256: 7fb92f95a6c8640dd84e01778ab2fe81bf75475440ad5fa7cc09e6bafd8600fb