Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54256dcdaa9edba…

MALICIOUS

PDF

96.1 KB Created: 2021-03-15 21:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1496a4fa7f9c9c08c9d16bbb5651688b SHA-1: 27f67807280768d9a282979e46f98b0f0d629c37 SHA-256: c54256dcdaa9edbafcc414ad6b1451c449aee82869018a1be14e463b0e007f1a
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of urgency and callback lures further supports a phishing or scam-related attack pattern. Although no scripts were explicitly extracted, the PDF structure and external link behavior are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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://jottigo.ru/wix?keyword=what+is+the+role+of+the+joint+information+system+healthstream
    • https://cdn.sqhk.co/sixepatexup/gfFN4VF/potter_puppet_pals_harry_s_nightmares.pdf
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/7211284.pdf
    • http://pawomodom.medianewsonline.com/53564126647.pdf
    • http://biwumani.mywebcommunity.org/mojonikoborula.pdf
    • https://xunuvetokogira.weebly.com/uploads/1/3/1/3/131384336/6833183.pdf
    • https://static.s123-cdn-static.com/uploads/4373749/normal_5ffcfe9f17725.pdf
    • https://cdn-cms.f-static.net/uploads/4389090/normal_6037da3e2a84f.pdf
    • http://naxajogilelog.medianewsonline.com/21029413292.pdf
    • https://cdn.sqhk.co/revogonesox/boOMEhd/jimerojopabojatesekebexi.pdf
    • https://tiwavejesuma.weebly.com/uploads/1/3/2/6/132681866/b6cee2fea9.pdf
    • https://cdn-cms.f-static.net/uploads/4373271/normal_604a6402ee6f1.pdf
    • http://forovasax.medianewsonline.com/titus_andronicus_summary_and_analysis.pdf
    • https://zakikewamipuvew.weebly.com/uploads/1/3/4/2/134234925/ledosaxikeka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/71bad130-4c28-48de-8e0a-185e2f014a9d/competencias_para_la_vida_plan_de_estudios_2011.pdf
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_b57123fd47dc47ed804cff1a47521f87.pdf?index=true
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_ff86dbcc95d64f07b48fc299ee394e0a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9d72b6c3-b0e6-4142-8d7d-23078011d3f4/toro_brush_cutter_parts.pdf
    • https://uploads.strikinglycdn.com/files/c15cab33-f08c-4755-b022-331a783c2e0b/joniboke.pdf
    • http://zeteximezoxa.myartsonline.com/polimumokupijifemolasamen.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c44.bin
3c9e21697b148134cf8668f7ce1f237d383dd5136a064fde5c540ab620f067fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 5196 bytes
font_01_sfnt_off00014ddb.bin
84c9eed073599028dfb61e3728ec503636faa2c542255c1119a4fa17224cbd26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDB 10832 bytes

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