Malicious PDF — malware analysis report

Static analysis result for SHA-256 7338f52795fbb408…

MALICIOUS

PDF

77.2 KB Created: 2021-04-15 13:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9f46509574670d1694be760375bbe735 SHA-1: ac992e4d095b1a54a090fab4b0d576775f4c0aa4 SHA-256: 7338f52795fbb4086c648682a61ad289818b69bf5cabe9b7291144073f945e7e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the linked content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=what+is+young%2527s+modulus+of+steel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477620/normal_5fd648030f6ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_6037be6a89124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_60417665ace21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_602bf677e1353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_601c67ff4b856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_60406bc6227e1.pdfIn PDF document text
    • http://mixikoxuve.22web.org/bissell_proheat_2x_instruction_booklet.pdfIn PDF document text
    • http://piloderib.22web.org/examen_de_comunicacion_tipo_ece_para_tercer_grado.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/galinikagopit/givevarupigufopa.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/34452197300.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_72f39bc3b24740ae94be6ceca44a30fd.pdf?index=trueIn PDF document text
    • http://fokafupu.rf.gd/shurflo_accumulator_tank_manual.pdfIn PDF document text
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_3da8225b877f43fe8d307a873c640d4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/netinuwa/counting_worksheets_for_kindergarten_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/46123430731.pdfIn PDF document text
    • http://xufesobikaxezo.epizy.com/vepux.pdfIn PDF document text
    • http://tidokapisu.epizy.com/vofovisi.pdfIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_f646578dab404f71b13737d7ac5a4e65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/autocad_viewer_online_download.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 5376 bytes
SHA-256: ce2afc760c4ca9553e12faefc8c73022891042989784dd8884d7e2170d0933a8
font_01_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 11356 bytes
SHA-256: 49e73c7f8742eb95e9d708077f8bb08343d806a5485f3f9aaf030baea5a653c6

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