Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61951f36fb88d69…

MALICIOUS

PDF

92.9 KB Created: 2021-03-18 12:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 546310b2f56bfbfa5bff6a07f029f084 SHA-1: 5044772c90f9d858972e7abd138fbf33eef8dd2c SHA-256: a61951f36fb88d693cbc7afbca90e078f345fb801d25f65a1623b2ccc1aebe19
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jumiwimov.ru/award?keyword=belt+conveyor+book+pdf PDF link annotation
    • https://mabalavorejeg.weebly.com/uploads/1/3/4/7/134769590/kofevijida-pabep-vivetixizab-filalux.pdfIn PDF document text
    • http://sunny-web.ru/99739621339100ig.pdfIn PDF document text
    • http://getegenufiduso.66ghz.com/bssc_admit_card_kaise_kare.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/ghbihN1/57431362193.pdfIn PDF document text
    • https://zevupizufaf.weebly.com/uploads/1/3/4/3/134315684/puziguge_lugaxojub_pusaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxogatuv/whbhjWY/kung_fu_zombie_dvd.pdfIn PDF document text
    • http://repair-planshetov.ru/wujirebajegisuvilutt4wlr.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/american_gods_cast_mr_nancy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/42fed660-86b2-42c5-9ceb-ac82c3b70ed1/formula_de_lewis_para_el_acido_sulfurico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2023c10a-2160-4722-af59-4ba62360e4d9/the_17_indisputable_laws_of_teamwork_audiobook.pdfIn PDF document text
    • http://gigonusotomofi.rf.gd/indonesian_food_recipes.pdfIn PDF document text
    • http://nibemodida.myartsonline.com/air_force_xy_group_previous_year_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eacbc878-b463-4547-a9ba-e6a166ce7bf5/pvc_pipe_3d_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb10cc9d-a652-4bd1-8668-ebe8c7fb27c4/tecumseh_hmsk80_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829daf40-26f3-4829-afcf-ab6d5df62908/what_is_the_difference_between_samsung_galaxy_s9_and_s10.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_off00012af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 5176 bytes
SHA-256: 121f51b015ba5a4bf246cbcd09b874e1cc99f61b2c9611d39a7085cd12606414
font_01_sfnt_off00013cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB9 11844 bytes
SHA-256: a0b3beb3fa528df8d5e7c6127a9e8fa4299a9acd72b688c5e05ecf127e9be508

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