Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d73cf2353cd16c8…

MALICIOUS

PDF

72.1 KB Created: 2021-06-07 19:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d53f0743bd9e460ca394d4a1f6e5419c SHA-1: 09d892bb94aa6929b1017c358b5aadf4b7b92106 SHA-256: 4d73cf2353cd16c8c2c42b316b6db725f302a30a634370d6a9210dd8f2b1e96e
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the true destination. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document describes new or changed bank instructions, a common tactic in business email compromise schemes. While no scripts were directly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious websites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://crysiq.ru/pbw?utm_term=epic+games+launcher+fortnite+free+download PDF link annotation
    • https://pufizemopuvagup.weebly.com/uploads/1/3/1/4/131407511/zonoveledoxunelixemo.pdfIn PDF document text
    • https://pizugezufe.weebly.com/uploads/1/3/7/5/137501548/ragas-dofebepalekose-magoruzamiwepo-roribeviduwi.pdfIn PDF document text
    • https://pezulotum.weebly.com/uploads/1/3/1/4/131483557/gadizo-zopuzodu.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/6b45d2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418556/normal_60273c420f524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446635/normal_5fd1d8efdc2e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_600ebd1976796.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421944/normal_6003554d8f0c0.pdfIn PDF document text
    • https://kefuvarunif.weebly.com/uploads/1/3/0/7/130739830/8236136.pdfIn PDF document text
    • https://rugazodexozapef.weebly.com/uploads/1/3/4/4/134480570/5ce4741af0d.pdfIn PDF document text
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/temoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489412/normal_605dba1dce543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zajozote.pbworks.com/w/file/fetch/144439020/pamelokipigezexok.pdfIn PDF document text
    • http://zepupifob.pbworks.com/f/1405031149.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/144560976/how_to_do_water_dragon_jutsu_hand_signs.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/sakusidanurobegi.pdfIn PDF document text
    • http://dagomiwavi.pbworks.com/w/file/fetch/144656622/xejozuguvam.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144411429/cost_to_polish_an_airstream.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/how_to_use_slime_tire_repair.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/w/file/fetch/144793851/29623358659.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_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 5620 bytes
SHA-256: 340d904787a7afc1db3e3abf234d0979e75d37e406821cc1f20e3ff1a390bdb0
font_01_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 10608 bytes
SHA-256: a288186d65e174342911040013b0f6ae6b8502196092b3a5374148d1fa1a988a