Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7da583fb61981f6…

MALICIOUS

PDF

82.9 KB Created: 2021-04-16 18:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e0fbb941eb0c45a6c6c6ecd6ea3d6ebc SHA-1: 9da920c3316c627380ef053d10143ed4b827a357 SHA-256: c7da583fb61981f6eff3c8c18fe76da53cd0d56b7a4a7ab00614fb0cbf7ec000
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malware. Heuristics indicate a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=accel+world+light+novel+volume+10 PDF link annotation
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/002c3a2.pdfIn PDF document text
    • http://creamwalls.online/dapoxijesufo5773l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_6018e5b17a4c9.pdfIn PDF document text
    • https://lenimupet.weebly.com/uploads/1/3/4/0/134013040/c79f245a16ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_601bb2babb9bc.pdfIn PDF document text
    • http://sallely.xyz/85209363152culom.pdfIn PDF document text
    • http://idealicaitalia.website/sony_alarm_clock_radio_cd_playermn5g4.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/suvabilakimux-vorawigiga-pusapo.pdfIn PDF document text
    • http://albatros-trans.ru/jaruvomubu5um2d.pdfIn PDF document text
    • http://artistichomesolutions.com/caracteristicas_del_sistema_politico_mexicano_de_1940_a_1988q4qv3.pdfIn PDF document text
    • http://presentinsta.online/towenexoledudugakxz1i.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/dibedisege.pdfIn PDF document text
    • http://nigasheff.xyz/685870489890tu51.pdfIn PDF document text
    • http://kzrovk.xyz/831443856648e31j.pdfIn PDF document text
    • http://websporizle3.com/revenumevi8l12b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_76dbbbbbbb244ba08a96eb2b4d946268.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_3bef329f9b8b4e01980d0b38dd7910bb.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_e62635a46fc64e3d91e67eb86aeea2d5.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_cf745303e2574b679e937883f3ebeb25.pdf?index=trueIn PDF document text
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_c8e1cc6b88ab41798b5f1eddb551dc24.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 5036 bytes
SHA-256: d18203b56a39e58294d16e9c3f1a720475c329c28ff4e69b508b7da427507e1c
font_01_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 5300 bytes
SHA-256: 2da679eb8c44b45a079edaa65def27a75ce59355183d04dc8c0813b912b721c6
font_02_sfnt_off0001180b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 10692 bytes
SHA-256: f23c607ef8ee56dc520e1525edd5afb2f4af081054f52978e5dcdabe8d2608bd