Malicious PDF — malware analysis report

Static analysis result for SHA-256 930532ea7abc1ab8…

MALICIOUS

PDF

79.9 KB Created: 2021-04-24 18:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 922f2b0a3c04abe716754e0ec74dd5f1 SHA-1: 21455cec8eaedc8e5704a9dc59eaad2fe1d95624 SHA-256: 930532ea7abc1ab8f87f0ef77682e0d12e97f95554fb530eeee33b7d5f7fa9f2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a domain associated with phishing activity. Heuristics indicate the PDF acts as a link farm, likely to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=free+software+operating+system+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425919/normal_6067f529113c0.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/2ef1b813.pdfIn PDF document text
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/8616697.pdfIn PDF document text
    • http://tenumuxuw.iblogger.org/clark_c500_y50_service_manual.pdfIn PDF document text
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/73ce514f9877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_6032d7c29c493.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/gewuvunifivilelatun.pdfIn PDF document text
    • https://lipegarexepi.weebly.com/uploads/1/3/5/4/135400683/1246914.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/kavezamexatafin.pdfIn PDF document text
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/4394406.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/jokotaziweluge/imperfetto_o_passato_prossimo_esempio.pdfIn PDF document text
    • http://dowirefe.rf.gd/88409052621.pdfIn PDF document text
    • http://fijorolur.myartsonline.com/sepusazafotukowinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c640d845-881e-48a3-a308-584444d2c19a/26241790109.pdfIn PDF document text
    • http://lobadonuvupadux.rf.gd/8205224218.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/fizozatexu.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/81805388649.pdfIn PDF document text
    • http://monazureme.epizy.com/gekusuzafizodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d19ce63-5534-4c34-bff6-dc38c4ba209e/32892865868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df50960d-2e96-481d-8438-e820990b1178/19918543744.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_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 5480 bytes
SHA-256: 06a372269b713e7fc69740f2099b0f373ecdeba5d8453c21bae59812ca23e172
font_01_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 10484 bytes
SHA-256: b52331f7252ff9df847e4b0099cc46b95fa34a1f149a3867e776cce52b344d2b

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