Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e9e55c8ef209aa…

MALICIOUS

PDF

72.5 KB Created: 2021-03-12 01:20:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ddca60856a5575cbdf6ef315fdbcc101 SHA-1: 6a9aafaef40d514a369555e51b38c2b5d1805272 SHA-256: 26e9e55c8ef209aad66d772d376c6e059feb3db4c4cf0913f6eeaa94eb762d5b
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to various websites, many of which are hosted on disposable domains. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content. ClamAV and ML classifiers have identified this file as malicious, specifically flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/award?keyword=mathematical+analysis+tom+m.+apostol+pdf+download PDF link annotation
    • https://bapumuper.weebly.com/uploads/1/3/1/1/131164114/rumosonoge.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/adjective_phrase_exercises.pdfIn PDF document text
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/95043.pdfIn PDF document text
    • http://rajajime.mypressonline.com/computer_organization_and_design_chapter_4_solutions.pdfIn PDF document text
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/9243628.pdfIn PDF document text
    • http://kukushpa.fun/what_is_the_move_objects_cheat_sims_334js5.pdfIn PDF document text
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/8226235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460228/normal_6006b042367a5.pdfIn PDF document text
    • https://dujapiloxi.weebly.com/uploads/1/3/1/8/131857305/4131414.pdfIn PDF document text
    • http://svoylend.xyz/revavunopigiwoa7579.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/jodusutu.pdfIn PDF document text
    • http://kinokaiff.space/diary_of_an_oxygen_thief_author_redditucmcj.pdfIn PDF document text
    • http://copyrightreports.com/kuwifiwisolejovoxo2szrf.pdfIn PDF document text
    • https://purotuduveb.weebly.com/uploads/1/3/0/7/130738796/644422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_602e5fea46d3b.pdfIn PDF document text
    • https://susatabunek.weebly.com/uploads/1/3/2/6/132695662/natepikuwufiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_602d9ccb67e57.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/11236248478.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/27304930-d739-47c4-a9bf-07396d3a0539/intermediate_microeconomics_with_calculus_9th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0bb1aff-2174-4a40-b437-0a51a1ea644d/19205676110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fe919a-0af6-4c11-97fa-e834eece678a/thermo_king_reefer_unit_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04bdd39-73f2-445e-8755-56487e526005/verbos_regulares_en_ingles_mas_usados.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_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 5532 bytes
SHA-256: b157fff01c648f07555a4cf24d74a9a0d19d7f7b309a520df8c498ecb7c798cf
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 10280 bytes
SHA-256: 50652bf4b4ac4069f7179ecd464b9b7dff8a04272e0a312270a56e1068aed6b2