Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4bbef13adef8f6…

MALICIOUS

PDF

104.7 KB Created: 2021-03-22 18:24:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70a4d901e99f22a7c9ac0895cebdec35 SHA-1: 12bd4bd4bdbf643892e9d94c5e3aaccaad3d37bb SHA-256: 1a4bbef13adef8f62de6eac29ebef748cf65e11589bf01304f6686c81510e321
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a domain associated with malicious activity. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=dsc-p72+memory+stick+compatibility
    • http://gifinibufenatar.medianewsonline.com/massey_ferguson_35_torque_specs.pdf
    • http://mosquito.codes/26586804437xyype.pdf
    • https://vebuxevofarina.weebly.com/uploads/1/3/4/0/134013543/7498358.pdf
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/2db129c472876c.pdf
    • http://witaxolexigabi.mywebcommunity.org/83082647592.pdf
    • https://toginomaba.weebly.com/uploads/1/3/4/0/134042469/joxigad-narojusanaxifu-debitazebafumet.pdf
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/da6f05f83d.pdf
    • http://mufutekuson.getenjoyment.net/muwasubaw.pdf
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/8898abbe05.pdf
    • https://suzujiwome.weebly.com/uploads/1/3/0/7/130776055/5c645b8a9de2602.pdf
    • https://gipebikurowa.weebly.com/uploads/1/3/4/0/134095939/69ed2969.pdf
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/215183.pdf
    • http://obuv-kozha.ru/frases_del_libro_el_principe_de_maquiaveloy5p24.pdf
    • https://wesarifalonaba.weebly.com/uploads/1/3/5/9/135961423/3c976d150683d.pdf
    • http://euroshopmn.space/85538166131l288m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_25d10b8d3056468fb8d45ad61eea4721.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eb6cce97-cf6b-4fd5-a129-3e5e017e8e08/bazotenafumuwosapari.pdf
    • https://uploads.strikinglycdn.com/files/b9f6359c-0de0-4460-b677-50e137fca251/91598624519.pdf
    • https://uploads.strikinglycdn.com/files/39055e54-3f7e-46f1-ab70-fb2d58ef2477/89279440097.pdf
    • http://kaxuwenewutexu.myartsonline.com/duties_of_a_chairperson_in_a_meeting.pdf
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_bee3db0949e34c098aa579e8ff591017.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e3963871-8fd4-4f24-b1ea-73a215438cb9/kaplan_mcat_prep_books_second_edition.pdf
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_80b6381356634324ac727ebc94c6368b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a2ef050-6031-469c-8f3a-38721b032b2e/best_c_book_for_beginners_reddit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146a4.bin
f3b2257e6a738a4c250286a2e1cafa103efdb1e84c8be9999f4da39a86c487ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146A4 5628 bytes
font_01_sfnt_off000159d8.bin
65777205ce16a2fe02a7f6ad2156c8b18b4917790009ed159083f5814d1ad2e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159D8 18492 bytes

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