Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cd34d471f3b2ab…

MALICIOUS

PDF

119.4 KB Created: 2021-04-24 05:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5d202af6ab2a1b59bcde35e43481ceb8 SHA-1: dc9287c76a563d078142e58c262f029af321b04f SHA-256: 73cd34d471f3b2abb1fa3d946603420f3270feb135094b7e4fb9569f03ca2a49
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 or SEO manipulation tactic. The presence of ClamAV detection and ML flagging strongly suggests malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external link farm are indicative of a malicious document, potentially serving as a lure for further compromise.

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
  • 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://botokaw.ru/strik?utm_term=functional+analysis+reverse+engineering PDF link annotation
    • http://futegejetebe.22web.org/what_are_fixed_variable_and_periodic_expenses.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/zgjUXAi/rotator_cuff_tear_test_cluster.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/gE9jfhc/87453614171.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/gj5gjaX/2d_shooter_sprites_free.pdfIn PDF document text
    • http://saxosoxajivovud.medianewsonline.com/furujebalopakubiborir.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/jdHOOgc/change_color_of_image_in_powerpoint.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_6a49b5ae0b5448f698aa3e84ce00ee08.pdf?index=trueIn PDF document text
    • https://a8a57b57-a5e9-4b5c-b824-02731ce3a1bd.filesusr.com/ugd/cfa667_aac3e4cf261d4ae6af5cac49ef888cc6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f406646-3eb5-4915-81f1-2dc684068484/coach_quakerbridge_mall.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/what_are_the_seven_rivers_in_africa.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_8e2938dbcbfe435e823c034942e3246f.pdf?index=trueIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_f83d9a7bd4d54fe8b3a40f50ab46e3a9.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_62ce8b21a947495e8a6429621b9fa54d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e767380-d246-47c2-ba1a-a4d840d9e792/what_does_e4_mean_on_the_power_pressure_cooker_xl.pdfIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_871744479c2d48d59e83aacd07da4ab1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca11add-5586-4997-ad06-9f467bd0897d/xopat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8915d8ea-5f81-4764-b182-fefba5d80468/mipafexi.pdfIn PDF document text
    • http://ruwapebubori.epizy.com/ieee_abstract_template.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_off000187e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187E0 2900 bytes
SHA-256: b7b260ddf4d191b6a327e24a8ce6e5bade73ba5b9f71a273ff02e8128d3bb49a
font_01_sfnt_off0001923c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1923C 5084 bytes
SHA-256: a613df047427a8ff76fc0fd5baf4f246842c8de88e1ad8d91aac777f34200355
font_02_sfnt_off0001a3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3B0 13460 bytes
SHA-256: 5dccf8bcaf7bf674a64d1094c28e6201624bb25ce3fbd51cf74acb2f46465ec4