Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df3800c3ff9b0f7…

MALICIOUS

PDF

81.5 KB Created: 2021-03-01 02:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 36fe2e58b97dcb4fc004f1298e2ab6c7 SHA-1: 7e0791b26fd70ebb9afa8fefe6b44b22dcbb8c88 SHA-256: 7df3800c3ff9b0f7af0b9c36f37fa41f23d83f1b994e656ff7be98166e5da89d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic firings indicate this is a malicious redirector and part of a link farm, suggesting the primary goal is to lure users to external sites. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=the+breadwinner+book+chapter+2 In PDF document text
    • https://betijefozivur.weebly.com/uploads/1/3/0/7/130776077/kopubezepuzoruzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468270/normal_5ff0025cb06d6.pdfIn PDF document text
    • http://zabavnyi-slon.ru/how_to_cure_a_cystic_pimple_at_home4po22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421612/normal_5fefcc97ed9cb.pdfIn PDF document text
    • http://leree4.club/lekemefomalegaxibomukeder2kmo8.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/jixezavep.pdfIn PDF document text
    • https://pafajarofotixo.weebly.com/uploads/1/3/4/7/134773208/1317046.pdfIn PDF document text
    • https://cdn.sqhk.co/wubukuxivupe/hrhjnie/fall_pops_3d_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455916/normal_60060e7485176.pdfIn PDF document text
    • http://hq-cleartv.info/395714683785okwo.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/jijumupade/fubuvedepawixafewusadi.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/java_code_file_from_server.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/xamawotuwozoxirubi.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/48249925552.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/vip_marathi_ringtone_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/3_bedroom_house_plans_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/auto_vs_manual_mustang_gt.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_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 5328 bytes
SHA-256: 267996e9f51d320ef687f90634b05abc20593b9a8b1143f786f3aa37ea757251
font_01_sfnt_off000115c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 10300 bytes
SHA-256: 1436d7373574215596244f91eadaac0ebab56efdcc257b506ce59c26cb42a691

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