Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c2d6d5407aebe3…

MALICIOUS

PDF

77.5 KB Created: 2020-12-29 17:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: d704288938ca4cac6510f7dd1a0cb995 SHA-1: 95f4b1209f02e83603eedb250646c13b70c3b1d7 SHA-256: b1c2d6d5407aebe377f70d37493f86de1ef30298bbd7c9a223586b7fe5dbbc96
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=earthquake+california+today In PDF document text
    • https://kusumuwuwudes.weebly.com/uploads/1/3/4/3/134338751/vazesixasikenu.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/F0hduhb/souq._com_dubai_watches.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/ruvewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490121/normal_5fab9498f1e80.pdfIn PDF document text
    • https://litaxavuve.weebly.com/uploads/1/3/4/8/134848922/kepovinokoxo.pdfIn PDF document text
    • https://gosupafitowiru.weebly.com/uploads/1/3/4/6/134673249/777898.pdfIn PDF document text
    • https://cdn.sqhk.co/wemonamo/fjejbEm/supabowodaxepazavadozulib.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/sabipo-fezanoropifotel-veramusizu.pdfIn PDF document text
    • https://cdn.sqhk.co/sezivalaw/idijkib/fall_guy_video_game_review.pdfIn PDF document text
    • https://rapaxexujimina.weebly.com/uploads/1/3/1/4/131454932/724ff7c840ebae.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/mejobu/dickies_work_trousers_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/selma_the_bridge_to_the_ballot_answers.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_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 5180 bytes
SHA-256: 49c1bf31c2dc82ff37733224b7573959584d60dca467ac1101ee44f9528fdcce
font_01_sfnt_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 11096 bytes
SHA-256: 390f612f1c7cd7b64a81d72ae4171a984eaf43768db4b8d6d78b94b6ea86f6e0

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