Malicious PDF — malware analysis report

Static analysis result for SHA-256 038e8fb2dd9d59a6…

MALICIOUS

PDF

80.6 KB Created: 2021-04-21 13:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a9a133525d0e2e5e570fb64d882ff4ec SHA-1: a5c5125cfed407202b55320f361dde53fbf78b4d SHA-256: 038e8fb2dd9d59a6ddae6d9fc70876982cfaaaa4a80aaa1caefe415fbe862145
154 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for a redirector link to dafemum.ru. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure the user to external malicious content, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://dafemum.ru/strik?utm_term=que+diferencia+hay+entre+materia+oscura+y+energia+oscura In PDF document text
    • https://cdn.sqhk.co/ripigopes/IDDjgjg/80801981450.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/TgfgiiY/jurassic_survival_island_evo_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fidakasari/n6cUia0/cervical_spine_ct_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/tojegaxamox/gijenSU/vofonopunudosejogemevopug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421966/normal_600c0fbe28688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366388/normal_5ffb047d26fed.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/icWigjb/63459896687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_604aa2daaceaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5ff9cce069f24.pdfIn PDF document text
    • https://cdn.sqhk.co/vatukaso/hd3gejj/63412916234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490929/normal_601e10120cf0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_60418d07bad69.pdfIn PDF document text
    • https://cdn.sqhk.co/poxufape/d3iFihf/36876112307.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/iakjaih/10878772832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463279/normal_6019809563bd9.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/f1jaJgc/975273245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/punurum/76431920364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86af977-928d-4e28-af3a-b548abeddb09/94388379083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24be634-4a1d-4b9f-aa58-3e5f00ce537c/avengers_infinity_war_movie_transcript.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/ratulabumadizowevewepisot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 5448 bytes
SHA-256: f9a1428c79fdd83ca272d8bdf87843be9d5a4d5efc512f27fd482df30d64ad74
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 12652 bytes
SHA-256: cffe169da5ffd640cca49751728f939b628ece22eaffb4336450164a53ef59a8
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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