Malicious PDF — malware analysis report

Static analysis result for SHA-256 1935f2fc68cab8f0…

MALICIOUS

PDF

75.4 KB Created: 2021-04-03 15:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6bf347b857a9361a5b90593d17844137 SHA-1: 2385c204af79aad92cee92d0b790652a43951bbc SHA-256: 1935f2fc68cab8f0240afba5107a74b533187ebb4ff35668fd7f53dc37f14cb2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm designed to drive traffic or host malicious content. The primary external URL observed is 'https://midufefew.ru/award?keyword=genetic+algorithm+matlab+code+pdf', which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=genetic+algorithm+matlab+code+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475854/normal_5ffefffdcc3cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465691/normal_5fde85e27ef8e.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/67850837334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416139/normal_5fd0f1a34b310.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/nutrition_musculation.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/hcDFRhI/personal_assistant_app_features.pdfIn PDF document text
    • https://cdn.sqhk.co/vumulevezuf/hfjgjdN/drag_racing_manager_mod_apk_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426830/normal_6004bdc2ca1f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366369/normal_5fed019cc463b.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/how_to_fix_samsung_microwave_not_heating.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/rainbird_5000_sprinkler_head_not_rotating.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/whirlpool_gold_microwave_oven_combo_door_error.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/ansys_cfx_introduction.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_47208ab0217241abb06916fd7f388ba8.pdf?index=trueIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_873021d95a1c4b46827f3664fc5a8b78.pdf?index=trueIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_c9d555dff434403d80e195878f0dddc3.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_93679bae0de6457c98da67a14205d92a.pdf?index=trueIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_279fdf8258dc40e0a46e3c7bb0f92672.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_cdf885cae1834f7ebeb385ce4b74ea33.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_8ebac8e65adb4b36817bc9ce8a350749.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_224524f93b3c448a8d52b7523737fe5a.pdf?index=trueIn 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_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 5560 bytes
SHA-256: 83bddc880f7dfa8aa515b3a6d16a08439018ff1cd23ead2f78deedeec1bec9c0
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 11152 bytes
SHA-256: d01e7e117341cd373aafb8592ededd3a2374ed8261032a75c039e9f49ef6a14d