Malicious PDF — malware analysis report

Static analysis result for SHA-256 033d2b17e30cb3a5…

MALICIOUS

PDF

88.3 KB Created: 2021-05-02 16:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dfd1c40a35b0daf4a6439225642e5b41 SHA-1: 1dca3c8dd5c2cc71318c5f53658b4eede840961b SHA-256: 033d2b17e30cb3a5067796116ea62ee01e3b2b97e5430981075bea6070c9f838
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/strik?utm_term=how+much+does+a+warehouse+make PDF link annotation
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/gebeje_suwixugaxiz_paluko.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/luninexikifobezulagal.pdfIn PDF document text
    • https://binegizid.weebly.com/uploads/1/3/4/7/134764074/jovivapoz_nowazej.pdfIn PDF document text
    • http://sandwichhq.club/joint_venture_agreement_template_nz65hm5.pdfIn PDF document text
    • http://afracheat2.xyz/rugelujo3tpzq.pdfIn PDF document text
    • http://usejus.pro/63653969301uyl5s.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/8307669128.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/3069937.pdfIn PDF document text
    • http://kfcrabota.ru/junulizikugag8vok.pdfIn PDF document text
    • http://sodaapp.club/telephones_with_answering_machines_for_the_elderlyl6yqx.pdfIn PDF document text
    • http://copyright-services-us.com/kezigozigibikusexonasosua8gf8.pdfIn PDF document text
    • https://guxuxexor.weebly.com/uploads/1/3/0/7/130775085/8f70e2130846.pdfIn PDF document text
    • http://mon-compte-cmb.best/6720930212307rip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fifonuvis.epizy.com/vanonipapom.pdfIn PDF document text
    • http://piwolimosopobu.myartsonline.com/74695311733.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/63232650148.pdfIn PDF document text
    • http://lirinuguwe.rf.gd/avent_bottle_sterilizer_how_much_water.pdfIn PDF document text
    • https://aeedc83c-a41d-4179-9d48-e770e4c4cd47.filesusr.com/ugd/e010a7_f53ff3991ebf4566bc59842bf28913f0.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_557b4c0dba374d82937d1bd17293a98f.pdf?index=trueIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_ce74e885d3fa408482cf7fa962c994dd.pdf?index=trueIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_407b5976008e46a6abcffac44d455a0c.pdf?index=trueIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_b8b501bb717946f1a3de762d09c5fe08.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_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 5264 bytes
SHA-256: 49b8c19dcd07c8f50d6b853d89cadcbf4e8875a30c687b11a675d15170078ebe
font_01_sfnt_off00012ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 11500 bytes
SHA-256: e5e58b14a9d8623cdfa8f97f7d2007ca17b2055573a2e0082dff8878c1bc9151