Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe552a80260e1f1…

MALICIOUS

PDF

78.8 KB Created: 2021-04-30 20:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fca8352bb18d666e6de751fb665c375a SHA-1: 224e10bec4694554459c2b60e31e0f24c3e39869 SHA-256: cfe552a80260e1f1a44e7f59e786efe6fd354824744359a4f9526907ccc21685
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to link farms and potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM and PDF_URI heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://gimoguvi.ru/strik?utm_term=does+samsung+tablet+run+windows PDF link annotation
    • http://vojiwilobir.22web.org/how_to_master_hand_to_hand_combat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370996/normal_5fdfdb61dcc31.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/xinagezifumaru.pdfIn PDF document text
    • https://bewimowijukoja.weebly.com/uploads/1/3/4/5/134584545/xadomagaz-manenakiruvaf-jiligokuxod-tamidesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417318/normal_5ff31c1ead45c.pdfIn PDF document text
    • https://luwimejimidilen.weebly.com/uploads/1/3/4/0/134040945/5828346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_602a51f9408e3.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/xozava_delupus.pdfIn PDF document text
    • https://miwejezapelo.weebly.com/uploads/1/3/4/3/134342363/8792255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_60321366687ed.pdfIn PDF document text
    • https://bezatawe.weebly.com/uploads/1/3/0/9/130968967/vijupafusisa-girutipuvevaxi-tanasoroxixo-vifedoxajadar.pdfIn PDF document text
    • https://wapixanap.weebly.com/uploads/1/3/1/1/131164574/xanefipovusowufi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393503/normal_5ff1b4d0eadcd.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/xoferuzu/what_calculator_is_needed_for_college_algebra.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/how_to_pass_algebra_1_staar.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/sig_sauer_legion_review.pdfIn PDF document text
    • http://jipinasin.epizy.com/blank_august_2019_calendar_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/81235092220.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_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 5376 bytes
SHA-256: 1b2ce2328a4f77233be0a3bf5fca9e3101fdd125d69f875843c1735830b937d2
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 10704 bytes
SHA-256: e2bd5450ea0439b1e06cbeb6391cdf0a21299333938492b53c0d954ea00f1b17

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