Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61c725b2670c388…

MALICIOUS

PDF

78.8 KB Created: 2021-04-03 04:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4c7acb252bcd833cd46f70761fe37044 SHA-1: cd820f6e7013efad3772747ed9cca7a0cd675f88 SHA-256: e61c725b2670c3888a6b1190eabae49350e27c7078eb44d47bf2cc1606119a98
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with several pointing to disposable hosting or suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=cateterismo+umbilical+en+neonatos+pdf PDF link annotation
    • http://babitilakibo.mywebcommunity.org/meperowoligix.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/the_history_of_contrastive_analysis.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/bwv_106.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/how_to_factory_reset_ur5u-8780l.pdfIn PDF document text
    • http://kolomakive.iblogger.org/zotawosedojeketifofizolo.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/botella_de_leyden.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/43348162946.pdfIn PDF document text
    • http://tiwujatujoput.mygamesonline.org/excel_formula_multiply_multiple_cells.pdfIn PDF document text
    • http://towexiwi.sportsontheweb.net/kasafas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vanatul/dell_optiplex_gx620_win7_audio_drivers.pdfIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_f34b87c2ec1c4a88936ba5b4f2e734b4.pdf?index=trueIn PDF document text
    • http://xifenarubomes.rf.gd/94794382590.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_89317d36ec00475dbce6eb4a9b229a27.pdf?index=trueIn PDF document text
    • http://nerezusilanake.atwebpages.com/ranaxafafagabekufet.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_e1a8738e8cd5423c87dce5652391081e.pdf?index=trueIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_dbaedf23f585418bbe2cfb92d728fc42.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f271fcf6-60d9-4b12-9d04-2dc9cf3d915c/machinerys_handbook_30th_edition_review.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/tribe_sebastian_junger_quotes.pdfIn PDF document text
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_27418cf8cd1c4bcbb41b188156857846.pdf?index=trueIn PDF document text
    • http://madigekole.onlinewebshop.net/fundamentals_of_general_organic_and_biological_chemistry_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9c936f-768c-463f-80b1-5a8777c6e90f/569478778.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_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 5344 bytes
SHA-256: 300dc8c42569d66cd3341942561f361f6c7a200e99baabe9798cf1c3d686644c
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 12012 bytes
SHA-256: c226458966c0ac6f6341029e3ef1c2d2ca4e4d5d57e372c2c6daaf4c124b86b7