Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4f2314acef8012…

MALICIOUS

PDF

71.8 KB Created: 2021-03-23 05:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4b67253d4bdfcfa845a9f70d8da92bd9 SHA-1: 201abee77abc14cea8963515288c9dc3d4e4a81f SHA-256: 8d4f2314acef8012aa4e04931d00ae9942acd16db462f8a417e184c0aabd551f
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URIs. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to direct users to potentially harmful content. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://dugedepap.ru/123?utm_term=curved+bottom+navigation+bar+android+github PDF link annotation
    • https://cdn.sqhk.co/xuxosoler/g5jeCWL/dukumejon.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/idNhiDo/latixexujo.pdfIn PDF document text
    • http://youla-24.cc/gupapixeketargw2g9.pdfIn PDF document text
    • https://cdn.sqhk.co/nevawanipo/RUD64Bx/last_valiant_code.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/PhhIJgc/22171858251.pdfIn PDF document text
    • http://vanlit.ru/all_in_one_report_writingwqwnv.pdfIn PDF document text
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/vekimevoka.pdfIn PDF document text
    • https://mufixedak.weebly.com/uploads/1/3/4/6/134602267/nokodiv.pdfIn PDF document text
    • http://vuvuga.xyz/39484619121jz6iv.pdfIn PDF document text
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/doxegedubupalixavive.pdfIn PDF document text
    • https://tusujowifavenag.weebly.com/uploads/1/3/1/4/131453847/1098572.pdfIn PDF document text
    • https://sebumowuvuxeluz.weebly.com/uploads/1/3/5/9/135962316/a9021f.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/c000feb.pdfIn PDF document text
    • https://gepadera.weebly.com/uploads/1/3/0/7/130740344/devezisulupotuwatozu.pdfIn PDF document text
    • http://naturaleone.space/4178222924ugvli.pdfIn PDF document text
    • http://itgermany.net/apple_ipod_nano_5th_generation_price_in_india5p0d3.pdfIn PDF document text
    • https://cdn.sqhk.co/waladoved/wigogca/sexuseto.pdfIn PDF document text
    • https://zizizibewanexu.weebly.com/uploads/1/3/0/7/130776642/b71cbc292.pdfIn PDF document text
    • https://razebefalokugex.weebly.com/uploads/1/3/4/8/134895215/fenenemenin.pdfIn PDF document text
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/1130977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_7076e75b5a1c4755bded5533af0edb7b.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_1a88d7355bfd471486d7bc90ff72d8b7.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_6414d3b816eb426fb858856de86693ea.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_80c387f4c7fa4d4fb0a31aa11e7e280a.pdf?index=trueIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_14cb6146ef154fd4ad7c831dd8cfff7b.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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 5132 bytes
SHA-256: f412425d24926daab5112588255fb6501943d22b2007a5cc9fb97b7ab12b26a8
font_01_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 11080 bytes
SHA-256: 93418758b124320f915d36e8171a7b39f9b3eebfd5588d3593ba5c3835bccd11