Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e23a98088cca309…

MALICIOUS

PDF

97.1 KB Created: 2021-05-11 21:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: defef4acd7aa33b9fc60a0deb9be9538 SHA-1: 5a3075e34927d9be93e9ad0d567c681347f670e3 SHA-256: 5e23a98088cca309329686cd5bf66c9df16dbb3575bdd23b6ffe2dea2c3b5625
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, as indicated by the 'SE_MFA_LURE' and 'SE_CALLBACK_LURE' heuristics. It contains a large number of external links, suggesting a link farm or redirection mechanism to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or directing users to exploit-serving pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/strik?utm_term=where+she+went+movie+release+date+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371799/normal_6044d860d5530.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/uXsjhfO/nabewiforaxujejimivafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_601e839a48fb9.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/MgigfF0/34182898941.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/jSWjeib/unique_retro_fridge_home_depot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_605ff05510b80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5ffa104f8b44b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490950/normal_6036362e032fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475861/normal_5ff6cf5e30e24.pdfIn PDF document text
    • https://cdn.sqhk.co/nubavojek/JCiaIrm/nanikenamudavejepokatixef.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/9858091.pdfIn PDF document text
    • https://cdn.sqhk.co/gabunufu/EZoiaah/box_office_collection_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/9ijohe0/nintendo_switch_tetris_99_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/jejhhiA/defy_gravity_ninja_course.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/iaoipgi/22418635368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_600ed02fe2352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477163/normal_603c761fb6a5b.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/4116339.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/62ecda23-b9bb-4b6e-9b45-417be8f503c1/1446439347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb726fd2-cff1-439d-b256-456390b2a60a/90791811445.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_off0001393f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393F 5748 bytes
SHA-256: 37beb8eb0a4c462039ca2eb29356323345041b5d3854173e1a852f94ab31671c
font_01_sfnt_off00014cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC2 12852 bytes
SHA-256: 61537ef88838b8e7fb85ca651e6c0a6be67c5ec783220b70dc403b0a311d2127

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