Malicious PDF — malware analysis report

Static analysis result for SHA-256 b878aee7237b4f1f…

MALICIOUS

PDF

74.5 KB Created: 2021-03-22 05:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: af34403728d35c65b77c97f5d282f84f SHA-1: 134414afcf915e95f3e9b6590ba091b44f86101f SHA-256: b878aee7237b4f1fe25a4f7006474f1a29e42554a4122e6da66f504b807a46dc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm suggests it could be used to deliver second-stage payloads or lead users to phishing sites.

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://golowaki.ru/123?utm_term=conjunction+worksheets+for+grade+7 PDF link annotation
    • http://top-agent.ru/directx_setup_errortvhrt.pdfIn PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/6257867.pdfIn PDF document text
    • http://whysmall.space/how_to_think_when_you_draw_with_lorerxqmj.pdfIn PDF document text
    • http://ryukzak.digital/jane_eyre_quizz2ihq.pdfIn PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/7148008.pdfIn PDF document text
    • http://anarchymedya.com/how_to_start_contempt_of_court_proceedings7pf4e.pdfIn PDF document text
    • http://philonio.online/public_administration_graduate_programs_nyccfnsp.pdfIn PDF document text
    • http://hookup153.online/who_is_the_strongest_gods_of_destructioncsvpv.pdfIn PDF document text
    • http://mesretly.xyz/texavepidobofolosezuwl74x5.pdfIn PDF document text
    • https://jimekijan.weebly.com/uploads/1/3/2/8/132815057/072f67c976543f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xewaditina.epizy.com/how_to_set_auto_on_black_and_decker_coffee_maker.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_f5857ce30d0647f092465a9d87339fd9.pdf?index=trueIn PDF document text
    • http://suludigana.epizy.com/fajapivexepozazagoke.pdfIn PDF document text
    • http://nagajawonusagu.epizy.com/xobumit.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_bfb386d31a4646e9a1b11b994607b3c2.pdf?index=trueIn PDF document text
    • http://bexalaxawuwe.rf.gd/74674846710.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_049af43b6c4047a9912de5a5eaa593f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c37770d-f92d-45f1-862d-4877b3174dc9/73514500467.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_7cf57b1e5f84455ea98e35ac1d47be25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bfe8c8d-3651-4dd6-bfbc-0c294f0f5b27/the_narrative_of_the_life_of_frederick_douglass_questions.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_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 5468 bytes
SHA-256: ed05842772f2d43de1bf6601a93fef44c3fc3ab970c9d194470d27fb05e7b717
font_01_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 10504 bytes
SHA-256: 0993520be9469b9c6b92385f3efe27b1cdb6fef0936c02f99042b4725759babc