Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fbc7a37625b0b4…

MALICIOUS

PDF

79.7 KB Created: 2021-02-04 05:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 8389673c3d3d6201b491ca7d8f8614b1 SHA-1: f14421f58c31aca29e5f6a0cd19b59056d72d8c6 SHA-256: b7fbc7a37625b0b4545540d05cae96cfb085b5eddba0620211268e21af81fd20
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest this is a phishing or malware distribution lure.

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://jacksth.ru/123?utm_term=free+old+christmas+movies+on+youtube PDF link annotation
    • https://cdn.sqhk.co/fipufose/PisERhb/science_wikipedia_in_telugu.pdfIn PDF document text
    • http://meblik.su/408252783717421z.pdfIn PDF document text
    • https://bebilakag.weebly.com/uploads/1/3/0/7/130776425/zipobawi.pdfIn PDF document text
    • https://mekegeno.weebly.com/uploads/1/3/1/8/131856852/xoxuvo.pdfIn PDF document text
    • http://petersikdar.com/27301649756uxfmk.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/fabebakuj.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/2ibhhPT/coloring_stitch_by_numbers_online_for_adults.pdfIn PDF document text
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/zulerufagigitimafimi.pdfIn PDF document text
    • http://microdigitalmeter.xyz/54674937187yjt.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/CjhHCji/zaxafelelinuvosarezedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_6011e35e990b0.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/fipesowifixem.pdfIn PDF document text
    • http://petersikdar.com/the_lover_duras_goodreadstwqy7.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/whiyeNP/rally_house_dallas_parkway.pdfIn PDF document text
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/4813527.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/mubefula/lowercase_writing_practice_sheets.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_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 5436 bytes
SHA-256: 09e3f7138cd3d4a1d12fc99853b767649430a5d2371d91849c0b0ab14deede77
font_01_sfnt_off00010dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 10608 bytes
SHA-256: 5193d74323e3a9ff8b637697fcb7c2edb86021646237a3a16d8d00e5f9ed7ca7

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