Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa044ee72943efe…

MALICIOUS

PDF

91.4 KB Created: 2021-03-07 21:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4310f8102008901452197db8dd108b23 SHA-1: 590cbed599cd45925af50e691858ad95be51010d SHA-256: 4aa044ee72943efeee61a79f3e6b7a12657dc24a6f7f0a177f9dc1f88a29e7ef
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier strongly suggests malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or redirection attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://leonvi.ru/strik?utm_term=wendy%2527s+bacon+pub+fries+nutrition PDF link annotation
    • http://govnososal.xyz/applied_research_studyowpqy.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/what_are_the_highest_paying_jobs_in_information_technology.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/gePZ3vI/5212054074.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/kelisajominurab.pdfIn PDF document text
    • https://cdn.sqhk.co/damapegapi/QjjRjiH/68261995411.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/UL6r4pM/nora_touch_your_feelings_mod_apk.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/how_do_you_do_conflict_resolutionyc62q.pdfIn PDF document text
    • http://findfreegirl.com/pudurebosgy4pg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxikemudenuma.epizy.com/47955844507.pdfIn PDF document text
    • http://jezawirigi.epizy.com/xolotutunadonaso.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_fb6894261fb4465695560714fca68c9d.pdf?index=trueIn PDF document text
    • http://ropupifalapoges.atwebpages.com/girl_with_the_dragon_tattoo_movies_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/218cafd8-8f7e-44ea-a1d4-71d54e4b5a4a/organisational_behaviour_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a1f0c4-8177-4322-a826-69dcd75d16d4/wukorevarodarodigev.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_1d8bfd2aa1f846a29ff787549f65084a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e72c81b-e9d6-48ec-a5fc-79c6f3606e23/mofupixatetabiv.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/interior_design_programs_canada_online.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_1fee52d6cac249d5b4c52602ef73b63d.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_a4fe829e2b554f3080e3a52344da0c32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/584ef06b-7ff9-4a9c-b27e-947d7e1f86d7/nefozimusukezajadoxol.pdfIn PDF document text
    • http://novezepif.rf.gd/rising_of_the_shield_hero_light_novel_amazon.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_ecf179afd7124b83ac9f035ef2730019.pdf?index=trueIn 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_off00012458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12458 5408 bytes
SHA-256: bc3549f838353cb28515a2cae67a66c0588c91139e69755a52c154c6b75728d9
font_01_sfnt_off000136e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E3 12072 bytes
SHA-256: c88b0c683dcf140727558704d48f8d8618ccb4d6c01ddbc13412a0e7096894f8

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