Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e882c5ed11dede…

MALICIOUS

PDF

83.4 KB Created: 2021-05-11 21:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e38ed406804ddc84367155ed8d407abc SHA-1: 778c78193260d3e6c635d7c61693b1f0d786dc80 SHA-256: 65e882c5ed11dede99fe03256c2f7fc9b725bbf68a270a1b3546672452a60dfc
156 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a link farm, with numerous external URLs pointing to other PDFs. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing or SEO manipulation scheme, likely intended to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://soxebez.ru/strik?utm_term=resistance+band+workout+plan+app
    • https://pumavamevimi.weebly.com/uploads/1/3/5/3/135391045/mezizoz.pdf
    • https://toralalog.weebly.com/uploads/1/3/1/4/131436966/xuwiwuxiwure-zumife-fovop.pdf
    • https://cdn-cms.f-static.net/uploads/4378157/normal_604cdcfcc5822.pdf
    • https://rebomavarel.weebly.com/uploads/1/3/4/8/134883959/1080613.pdf
    • http://kungfumalibu.com/evinrude_25_hp_etec_pricel2scj.pdf
    • http://justiciaforjustice.com/wiripavz0w6h.pdf
    • https://cdn-cms.f-static.net/uploads/4424007/normal_6020626c74d64.pdf
    • http://peuly.xyz/how_to_use_rug_doctor_on_couchmox8m.pdf
    • https://cdn-cms.f-static.net/uploads/4470689/normal_6028e6ff73375.pdf
    • https://cdn-cms.f-static.net/uploads/4402940/normal_6021687cdfc1e.pdf
    • https://cdn-cms.f-static.net/uploads/4403674/normal_604168d8c304e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b08676cf-2cd5-4098-99ee-d92fcea48976/is_the_collector_evil.pdf
    • https://uploads.strikinglycdn.com/files/765a8ab4-07ea-46d4-8f3f-9ab8f1ea8d0e/41800822859.pdf
    • https://uploads.strikinglycdn.com/files/8eb3d894-a89a-4495-b1b1-e137a530f3dc/2011_rav4_v6_oil_capacity.pdf
    • https://uploads.strikinglycdn.com/files/7539a2c9-54c2-4439-b1ad-0200f5e5f258/64819144254.pdf
    • https://uploads.strikinglycdn.com/files/f77f5ab7-9461-4e2b-8880-8d0a8f18f31e/eheim_2217_filter_setup.pdf
    • https://uploads.strikinglycdn.com/files/12388c2d-05a5-441c-ae04-c9f0e7b74e0f/30072505076.pdf
    • https://uploads.strikinglycdn.com/files/5f799b88-bdf1-40cb-b723-d5e45418d0cc/free_printable_atomic_habits_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/ee2fd964-fc46-4d90-bf57-85a01eda38f5/how_do_i_unlock_the_retail_lock_on_my_toshiba_tv.pdf
    • https://uploads.strikinglycdn.com/files/05698774-9d98-455f-be77-194e0cf4f944/wobifetut.pdf
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa0f.bin
2d27ce7e57fc91ca290e37813bbc78e7ad1df51693517a23e573f5d87ef2d4c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 5252 bytes
font_01_sfnt_off00010bfe.bin
991a06da02ead46332ab212725f94dff808ff65f8769122ee989f9f60273d863
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 11268 bytes
font_02_sfnt_off0001325d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1325D 4324 bytes