Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9a5d0df2306160…

MALICIOUS

PDF

75.5 KB Created: 2021-02-14 21:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: da560e9a4d865c05010f632767d36dd6 SHA-1: 96d5c8cdbeb67ccfa87b7f6befc7bb32eb4123b3 SHA-256: 3e9a5d0df23061607a6a24237d46987d3cfbb44e45b15cd7a65a3e5e72cdd5c5
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 redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further payloads or phish users. The embedded URLs and the heuristic findings of a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' confirm this behavior.

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://jacksth.ru/123?utm_term=conjugate+acid+base+pair+chem+worksheet+19-2 PDF link annotation
    • http://basiditdcf.space/tutafuwoxifubevaser7dtn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424376/normal_5fd2598618562.pdfIn PDF document text
    • http://pet-guru.shop/average_lyft_driver_salary_los_angelesf4o7d.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/Gicieje/vuralibonawama.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/hgdidai/nipuxuzin.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/lvjcihT/swish_shot_basketball_shooting_game.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/jomufasovuzekawivi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fe5a1541c311.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/e58HjiD/xomagavezolawiregox.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/SibPHjd/joplin_mall_stores_open.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/dicwgha/mino_monsters_2_evolution_not_working.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/zagutemixujoga_toloda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5fcb5336542a2.pdfIn PDF document text
    • http://natbeach.space/76170596626k4jc4.pdfIn PDF document text
    • http://edarudost.online/losusutoxexulufuniwsvra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470839/normal_5fe2228e7109a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_6005bc8ca4421.pdfIn PDF document text
    • https://talidifixuj.weebly.com/uploads/1/3/5/3/135390844/4263e1ebed.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/4b1f29d4360d879.pdfIn PDF document text
    • http://gtmedis.com/19253446928aml3s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 6104 bytes
SHA-256: eba39718f7d2994313d15abd2db3b15c6f02f336c453d14a163ae8b2c899d726
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 10608 bytes
SHA-256: 5acdf77366191379bdd8ed9af25ea9e304feefb8e25ebaa831dd65b8c944dad9
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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