Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c454d3aaa32b1fc…

MALICIOUS

PDF

73.9 KB Created: 2021-01-25 20:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0aeb2abc2297ab17ca23c32247f4bfa0 SHA-1: 4d5ae18d6301f294bc66433ce21d8790e99736f1 SHA-256: 1c454d3aaa32b1fc84b97b7f39fd209c415d8ec8f6e31d9e4bed34b4b20e334c
264 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, specifically a fake quiz designed to trick users into clicking malicious links. The presence of numerous external links, including those pointing to PDF files on various domains, suggests a link farm or a mechanism for distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 9

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/aws?utm_term=medical+terminology+questions+pdf PDF link annotation
    • https://cdn.sqhk.co/kizofapekeku/FjlFIjd/60033496174.pdfIn PDF document text
    • https://guparamoribum.weebly.com/uploads/1/3/2/7/132711937/91246b.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/QDyK8jb/fosuxogenu.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/Jiajhjg/magic_dream_tiles_bts_game_4_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5ffdc7ca82460.pdfIn PDF document text
    • https://dewofawofuzujo.weebly.com/uploads/1/3/0/7/130775987/490100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420449/normal_5ffbe26a2a423.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/bThd2hh/godus_wars_gameplay.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/62aa1828f68f81d.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/ifJiaie/nujat.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/hjDjfgg/boy_hairstyles_afro.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/4MHifhi/96435982025.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375891/normal_5fe1e977bdd29.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/jd6iiJS/kewexivapuba.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/podawakumepewez/niv_bible_apps_for_android_free.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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 5708 bytes
SHA-256: d7b2a5f8be3ec884d7b3da825ec53b8fd211a6c2fd6bbfb7816e97c3692312c2
font_01_sfnt_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 10724 bytes
SHA-256: a3afa72705925bbd7161a86544b53491af7b8e8fe7e36c01211208415073adc9

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