Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a566de5fd47e3a…

MALICIOUS

PDF

78.6 KB Created: 2021-03-29 04:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 792e2829c1548596fca0fe4d1ba11a64 SHA-1: 84553bccdced87ec4e6f3bdaf9c58e611a6f46ff SHA-256: 37a566de5fd47e3ac3350ab5cce5e37aea202b8021688a8076a6c44f2bc48323
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains, indicating a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain search terms related to a book, suggesting a lure to drive traffic to these malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://crophysi.ru/award?keyword=los+sue%25C3%25B1os+de+helena+eduardo+galeano+pdf+descargar In PDF document text
    • http://tidedejix.iblogger.org/aprendizaje_activo_definicion.pdfIn PDF document text
    • http://padusapagim.iblogger.org/thyristor_triggering_circuit.pdfIn PDF document text
    • https://xuzuvakewose.weebly.com/uploads/1/3/1/6/131637797/berasivad-femenusima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_5fe72e015a7b5.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/pofuwisovo_buvuraki_juruwo_wigegexowani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_601cce7950a65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481161/normal_60502b737d278.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_0bd24faa1ffc4fae96838e24515a2fe7.pdf?index=trueIn PDF document text
    • http://munakazoxan.epizy.com/a_song_of_ice_and_fire_full_character_list.pdfIn PDF document text
    • http://sabulawum.rf.gd/historia_del_espiritismo_arthur_conan_doyle.pdfIn PDF document text
    • http://xepolowamozuxan.rf.gd/zufufexiseniwibeku.pdfIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_52ea50de5cd448019cfa9971cbf3334c.pdf?index=trueIn PDF document text
    • http://denufukis.epizy.com/522416001.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_2e588e2ddf974013bae0acc4c66a35dd.pdf?index=trueIn PDF document text
    • http://kelukotezowopob.epizy.com/nudagokekobef.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_1921c11ad326478f994dfe057e8ec703.pdf?index=trueIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_f0175c8c72f74c5289b58efbfcf575da.pdf?index=trueIn PDF document text
    • http://fuvovidesom.epizy.com/calvary_reformed_church_orland_park.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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 5324 bytes
SHA-256: 883c67cfa8149098c3b38eac899b6cb80f7b580dea88a0ef029e586123ffc888
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 12720 bytes
SHA-256: 382819cf5ae2e723ecdbc0a7bc53ddac34c84bc02d1315ecbd4fb13912cdcf0c
font_02_sfnt_off00011c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378