Malicious PDF — malware analysis report

Static analysis result for SHA-256 28abc2c1090541f8…

MALICIOUS

PDF

91.6 KB Created: 2021-03-18 16:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7653d1e924807dff5f2424a831bdee2b SHA-1: e9f2602496b151cf0e8806c766e15ae7bbd96e39 SHA-256: 28abc2c1090541f8a23b898759b1f1011931929f362eb830eb5b93567dab36d2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly 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 0.9997

Heuristics 6

  • 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.
  • 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 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://golowaki.ru/123?utm_term=camera+picture+94+answers
    • https://cdn.sqhk.co/lekusovu/cGujdhe/23084861046.pdf
    • https://static.s123-cdn-static.com/uploads/4455914/normal_6003f7cecf4a0.pdf
    • http://xumosigebazu.iblogger.org/24675982843.pdf
    • https://cdn.sqhk.co/vesagivara/DZhaFvP/xupelenapepuxaduruk.pdf
    • http://setlyb.online/como_crear_un_archivo_en_linux_desde_la_terminalf57aw.pdf
    • http://salogogudezofa.iblogger.org/vukixefunixezozexor.pdf
    • https://cdn-cms.f-static.net/uploads/4499635/normal_601158bf0f6ef.pdf
    • https://cdn.sqhk.co/tefazaturar/jeGhjNW/hd_wallpaper_new_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5fd887a2731d7.pdf
    • https://static.s123-cdn-static.com/uploads/4463830/normal_5fcc7fae2098d.pdf
    • http://gratoraama.space/vr_theater_for_cardboard_apkdc9az.pdf
    • http://biomaniks.website/tivejakomorurarokerk28jl.pdf
    • http://7lessons.website/30415883793hp8ik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_b9f2f13509de49f8b0fbf140f11d9410.pdf?index=true
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_0d9a9e31b9304156a1747c9807dcebd4.pdf?index=true
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_7dfd0423775c42e681d541488c3af9b5.pdf?index=true
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_83d30b8c89b549348ad32132bdf700b0.pdf?index=true
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_6a31cb39d19443228f1adffda9d6599c.pdf?index=true
    • http://debarunuzijabe.rf.gd/lanewofanipije.pdf
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_6563d80c4d4a434b8c03dc1af70a7ebb.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dbc.bin
a05aea82b8f8539d6446402349da66029a6893d3cfe7fd64efac30b1571ee080		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 5288 bytes
font_01_sfnt_off00011fb0.bin
876c47f5fc19722c8defe5db9584c59e4feb17de34375ecbee3e3b436e49f792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 13156 bytes
font_02_sfnt_off00014b25.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B25 16312 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.