Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf4019e1e85809f…

MALICIOUS

PDF

97.2 KB Created: 2021-04-24 19:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0ecc6f80f9c30103c16ba3aff81a7ad3 SHA-1: 0d26243bae3d282586450e8127bcac95bd219466 SHA-256: 0cf4019e1e85809f93a16d7f7b767dff7261c2a068ecbf59ed5754080dcec25d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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.
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=craftsman+lt2000+mower+deck+parts+diagram PDF link annotation
    • https://robidolaw.weebly.com/uploads/1/3/0/7/130776002/jadegifo-sazazemuwi.pdfIn PDF document text
    • http://fakaripeti.xyz/81194658355t68je.pdfIn PDF document text
    • http://ladukusuga.22web.org/zisama.pdfIn PDF document text
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/8c92a6.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/kubota_engine_parts_manual.pdfIn PDF document text
    • http://curvepreloved.com/manual_camera_pro_dslr_camera_hd_professional_apkpurekg5ta.pdfIn PDF document text
    • https://forelidik.weebly.com/uploads/1/3/0/7/130775511/68955473.pdfIn PDF document text
    • https://nusuwexob.weebly.com/uploads/1/3/4/3/134352417/4579985.pdfIn PDF document text
    • http://danivufulof.iblogger.org/mevituseliledokiteriku.pdfIn PDF document text
    • https://libizewixowu.weebly.com/uploads/1/3/4/4/134432873/nunuxibolu_wutajivire.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/22143235272.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/silepivalafewu.pdfIn PDF document text
    • http://about-central.com/93431883069a2drt.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/5095c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/security_guard_standard_operating_procedures.pdfIn PDF document text
    • http://gulejarapexovut.epizy.com/formal_letter_outline_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/kekif.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/what_is_the_rarest_human_mutation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 5716 bytes
SHA-256: 96d8f2494cbfdf71099a5f7103cd81f39e46a23017c998c64f6d6b83aa183929
font_01_sfnt_off00013c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C08 13536 bytes
SHA-256: cb672c1c525bb6b45c7f579be6a3c9daebcd9976521bd5fea55e8882bcaf1ba1
font_02_sfnt_off0001697c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1697C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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