Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66e4bfbcb3df608…

MALICIOUS

PDF

90.5 KB Created: 2021-03-06 06:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5f2cf083ece812ca8c1b806b0886a8a8 SHA-1: ff188d065cf30ee036183cf1ad19b52d77be824d SHA-256: c66e4bfbcb3df6089b7563022f157b6db9f49060f4790cd5a1547450c833b5ba
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO abuse tactic. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number for support or billing issues, a common phishing or scam pattern. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://xezojetit.ru/wix?keyword=30+days+on+minimum+wage+essay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453129/normal_602ce84d6fc0d.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/hbjfhag/halloween_movies_on_disney_plus_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/judixixelof/jjigA7f/52633945547.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/B7jahe6/kixanodabuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_603743b4d258b.pdfIn PDF document text
    • https://niruzezigup.weebly.com/uploads/1/3/4/8/134889773/pixiwijefavura.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/mbgjigC/vexation_meaning_in_bengali.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_600716961629f.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/mukosinemoj_zukujegit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415068/normal_5fe328ec18a6c.pdfIn PDF document text
    • https://tepaxomiro.weebly.com/uploads/1/3/6/0/136019937/969ac218fcf8c3c.pdfIn PDF document text
    • https://losaburi.weebly.com/uploads/1/3/5/3/135322327/22fa63f325fa06.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/fapaga/18685390707.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/jisase.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/jomixutujidu.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/popurewogidutuvavufeteni.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/msc_zoology_entrance_exam_books.pdfIn PDF document text
    • http://dogiwexor.myartsonline.com/97192833525.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/85136875842.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/marathon_durandal_achievement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/guvaxe.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_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 5424 bytes
SHA-256: 12499e821ef51761563096b60ede89d8231723638623ca883c13d65e3fe58453
font_01_sfnt_off0001371b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371B 11140 bytes
SHA-256: 0cce33a65ac7a1669d8bf5d640d64bdef2724769fd34c5649f5279aaf3437d48

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