Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a3bb21534e97fb…

MALICIOUS

PDF

84.2 KB Created: 2021-04-02 00:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69f3d229a4e147f545845ce8557c5855 SHA-1: def3cf9cc9d2cba3a11df114810f07152c7259fc SHA-256: 92a3bb21534e97fb206e63f6182a14b8cfeff3b7f84fdf084fa2350ff517f475
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1059.007 JavaScript

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services, suggesting a link farm or redirection infrastructure. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document's content is designed to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise. While no scripts were directly extracted, the presence of numerous external links and the nature of the heuristics strongly suggest the PDF is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://pelibifir.ru/strik?utm_term=american+covid+death+numbers
    • https://cdn.sqhk.co/kamupudoro/jjgflia/80625587996.pdf
    • http://jezewujedufeg.iblogger.org/70790525002.pdf
    • https://cdn-cms.f-static.net/uploads/4448992/normal_602a253a4b2cb.pdf
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdf
    • https://cdn.sqhk.co/dodirorip/id0hay5/animal_planet_insane_pools_bird_sanctuary.pdf
    • https://cdn-cms.f-static.net/uploads/4485801/normal_60634ac2a87b6.pdf
    • https://cdn-cms.f-static.net/uploads/4380213/normal_6062ad53f22fd.pdf
    • https://cdn.sqhk.co/jeporikate/aiiAgif/galaxian_nes_manual.pdf
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5ff982c28c1ee.pdf
    • https://joxefumisati.weebly.com/uploads/1/3/1/4/131406837/5350481.pdf
    • http://fapasevusiledap.mygamesonline.org/9897379971.pdf
    • https://cdn.sqhk.co/jasojime/jbifhe3/awesome_tanks_unblocked_at_school.pdf
    • http://takipibimaxubov.sportsontheweb.net/catalogo_virtual_jequiti.pdf
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/mutimozolilej_lebor.pdf
    • https://kenojitoxudu.weebly.com/uploads/1/3/1/3/131383977/devokowadoranot-gizifeketiros-mazorujijo-nosiwarisidabin.pdf
    • https://xoxawipexari.weebly.com/uploads/1/3/0/7/130775732/kumifemekefak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lufuzefaz.epizy.com/30342331772.pdf
    • https://uploads.strikinglycdn.com/files/0fd690e2-ed4a-43ef-81d6-70de05c165ac/cute_music_notes_coloring_pages.pdf
    • http://womutefipile.epizy.com/gelerumugodotero.pdf
    • http://jegovogetaferop.epizy.com/how_to_prepare_for_gastric_bypass_surgery.pdf
    • https://uploads.strikinglycdn.com/files/5baa5ecb-2d5b-4257-8ce6-9db58d52135f/23443150406.pdf
    • https://uploads.strikinglycdn.com/files/a86df53b-9acf-484a-8e50-03946937f75f/what_are_the_types_of_organizational_culture.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff7b.bin
e06f7c4e647892ac1834ff50e6783b9139769d11c5effc56d31edf6c961ea759		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 5220 bytes
font_01_sfnt_off000110fb.bin
86975fee5fbf4577aed9d6277080f3bdff40be20bfffdde03ae3d105cc68177e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 10640 bytes
font_02_sfnt_off00013558.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13558 4324 bytes

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