Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f85b943cb56e65…

MALICIOUS

PDF

75.0 KB Created: 2021-02-28 08:28:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 432b8cd40e65c02f6d124033b7114cef SHA-1: 171cad764df1e6f7910512359faba478d5453078 SHA-256: 06f85b943cb56e6556a0051b7a32b13b016a4e29488cd69a936f79376955e42d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book summaries, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked URLs. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/aws?utm_term=funny+books+for+young+adults
    • http://piredvizhnik.com/the_maze_runner_book_summary_shortpsn2r.pdf
    • https://cdn.sqhk.co/tinipuded/QZjcuq1/31315674108.pdf
    • https://cdn.sqhk.co/dukosisevu/icThjji/kivagex.pdf
    • http://frontglass.xyz/what_is_the_message_of_the_laramie_project2qqas.pdf
    • http://love-cosmetics.shop/kindle_model_d01100_review5c7af.pdf
    • http://tejasatobes.medianewsonline.com/10442317556.pdf
    • https://cdn.sqhk.co/kepilujofeje/lgcUkgT/97420732227.pdf
    • https://cdn.sqhk.co/pagifizipafo/cZdhdje/gudiritixarabukufapide.pdf
    • http://fakixigulidol.mywebcommunity.org/88848118354.pdf
    • https://cdn.sqhk.co/vapezuwe/idhfif5/37292045155.pdf
    • http://lazerepil.site/48390985959icul3.pdf
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/rilavelomavuti-wedurisat-wimeteteji-gesiwiruxivedud.pdf
    • https://cdn.sqhk.co/xenumobavun/sdjnvjc/siraketizikudotazupowuj.pdf
    • http://mynasert.online/icbc_insurance_report_a_claimortap.pdf
    • https://cdn.sqhk.co/jevamivuvugi/djbXkpw/zombie_road_killer_apk_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://luvabokinoleg.onlinewebshop.net/muzanapaliligular.pdf
    • http://wififeju.atwebpages.com/legelexomewutonelul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0c.bin
dd2c98381de518bc4b80e29b44dafb76a1f3f68021f37b374b384f0ff2bb5749
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 5336 bytes
font_01_sfnt_off0000fc4f.bin
e4859dde74fbca63a1d176655ff565fdb3bb3b3bc2af77ea497430457c38134f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 10236 bytes