Malicious PDF — malware analysis report

Static analysis result for SHA-256 4995d2ab53e525a7…

MALICIOUS

PDF

75.5 KB Created: 2021-04-14 06:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c13530fc10eb975c3d87804ad14713b9 SHA-1: 5e2df4b44785f869e8d8a87277d349de846fd230 SHA-256: 4995d2ab53e525a719e084d71018eec159cb16a7579ff8df80e668c4d72edef6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=how+to+find+the+mass+of+an+element+in+a+compound PDF link annotation
    • http://xoziduso.mypressonline.com/tufapavetud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419828/normal_5ff9a896e6199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_603e6e48a61ce.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/favuwadexegedigixosaru.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/iiYgcif/first_rugby_league_game_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/sjijjjh/13277624967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450884/normal_6000679276317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_6022d21cd7f0a.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/gjQjcmR/lg_health_app_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5ff3509113ec9.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/jijcahi/6152920813.pdfIn PDF document text
    • http://ladirojenovezoj.mygamesonline.org/fexajalapulu.pdfIn PDF document text
    • https://cdn.sqhk.co/xofozomuwef/r1tgdWA/bouncemasters_mod_apk_unlimited_everything.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_60360883e76a9.pdfIn PDF document text
    • http://sobuvide.mygamesonline.org/raxakatitubi.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/094aecfe-5dbb-4821-9c97-bdac1d64d43e/77566379223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e611c5d8-51cb-439e-b83c-55d9c1501ce6/pathfinder_2nd_edition_players_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373f8a68-9286-4298-b043-7b30495960fc/geworufesazisabudidefiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86c3b08-528a-4b7a-985e-9c6829154c3b/85840694218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a64b998-5f2c-4cbd-9c92-dd18ec218404/what_is_machine_elements.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_ea4f8e14838244baa367a2c856b70f81.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_8cc70925009c4c8499706893f23c33e0.pdf?index=trueIn PDF document text
    • http://zivexotafoni.myartsonline.com/mathematical_analysis_tom_apostol.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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 5352 bytes
SHA-256: 8b1700bae03e9aa269cc76cc4dc30942e175bee200aea25dceb497cc8db4665a
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 11352 bytes
SHA-256: c01a2bec28480dd2766ae1325dbd1054f27af8b64b5c93db6c629819f3fd15a9