Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ea16cbe8e3bb3e…

MALICIOUS

PDF

91.2 KB Created: 2021-03-27 19:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 80ba34adc568fcb3a67fd4fc4747ce7a SHA-1: f872393e42e4362401a60931b31991b20cbca0f9 SHA-256: 40ea16cbe8e3bb3eb67d145f11c47938a4334b4cb67c0b06a7a431991e8fc65d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 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://lozipotod.ru/wix?keyword=pythagorean+triples+worksheet+answers PDF link annotation
    • http://cetakchantek.com/worum4yc77.pdfIn PDF document text
    • http://shoppingyxplus.xyz/duludejivegipajd7m.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/jgeifie/granny_chapter_two_apk_old_version.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CKsihKb/40504930244.pdfIn PDF document text
    • http://vinograd.io/wilotodezivusubilumogao0rue.pdfIn PDF document text
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/1b38d7f4e.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/LkijJPG/labyrinth_maze_game_online.pdfIn PDF document text
    • https://ladolijid.weebly.com/uploads/1/3/2/8/132816107/51caca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470521/normal_5fe0e4fb3e8b7.pdfIn PDF document text
    • https://cdn.sqhk.co/jegivoziba/Kjgihhe/turkish_march_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fcbf6ac57b56.pdfIn PDF document text
    • https://kofavuzaxo.weebly.com/uploads/1/3/0/8/130873868/8251910.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/yjh7hfD/suwofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_5fd33786634f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480585/normal_604cdac420cd8.pdfIn PDF document text
    • http://vsspb.ru/acil_strobe_beacon3r8fi.pdfIn PDF document text
    • https://bavamelamasol.weebly.com/uploads/1/3/4/7/134714994/gasumarewolodagumuxa.pdfIn PDF document text
    • http://auth02mobility.com/what_is_a_neon_diamond_pet_worth_in_adopt_mesw7lh.pdfIn PDF document text
    • http://health-top.ru/tumitaxerespvj0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_6051cb098cc0c.pdfIn PDF document text
    • http://ukrdomonis.xyz/head_first_pmp_latest_edition_2021u9ucp.pdfIn PDF document text
    • http://inostrana.com/foxurimozupusune8fpkt.pdfIn PDF document text
    • http://milanomodaitaly.site/mobetuwezavovufudaxajafogrr1j.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/lidonatafipi.pdfIn PDF document text
    • http://sk-anker.ru/piwoxefonumefisokofh5tqj.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/f0501e52-807d-49e3-8f87-999359e575d9/sufupitosojozukof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6b5ee8-35d1-4664-bcb5-2bf892f880e3/the_2_strands_of_dna_are_considered_what_to_each_other.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/949ce9c0-a1a5-41e5-9e5d-d0a1f9dd9c73/29904889000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615f7e37-5889-4b67-b177-153bfb54e565/casio_rangeman_gpr-b1000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9368cff-8c8b-42db-864a-5dffdb1c5178/33996479104.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 5340 bytes
SHA-256: 94166885af178f68f42621c60bf5e89d50b1f3275919d8e716a252a8c70eb1eb
font_01_sfnt_off00012219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 11712 bytes
SHA-256: 070cf9b1ca8f9bf33d8bb5e169efb48cd3bbc60a8cf9cc8d18bf83cc5e2ab398
font_02_sfnt_off00014a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A33 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848