Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf3ba131779321a…

MALICIOUS

PDF

84.9 KB Created: 2021-03-13 21:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 52f11d3a2511026e6b681e09c37c0cf1 SHA-1: a1dbc905fccb643163d794994d602852fbeef130 SHA-256: 9cf3ba131779321a10c31eb569e270f3532f21459946ac3a882b4ce34370d844
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'hockey rink diagram pdf', likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=hockey+rink+diagram+pdf PDF link annotation
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/1866136.pdfIn PDF document text
    • https://lareduna.weebly.com/uploads/1/3/1/4/131453109/7254003.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/8206382.pdfIn PDF document text
    • https://fotaluxig.weebly.com/uploads/1/3/5/9/135973299/pupip.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/gomiwesebegezijudewum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_604145bb795b0.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/ahijegd/idle_pocket_crafter_mod_apk_android_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365655/normal_5ff0bec31cb3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_6016613984cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_603883e534ae2.pdfIn PDF document text
    • https://saxunada.weebly.com/uploads/1/3/4/8/134865385/0cc5f91a.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/16701746659.pdfIn PDF document text
    • https://cdn.sqhk.co/fekoguwiwu/ejPHHgi/kung_fu_tea_malden_delivery.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/6397085053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459463/normal_5fca0b60badfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495059/normal_5fec0e64e5d39.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/network_security_firewalls_and_vpns_2nd_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6167d646-b9b5-48e3-bd97-cfd1b77b93b3/99446922618.pdfIn PDF document text
    • http://futebowa.atwebpages.com/internal_and_external_barriers_of_communication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c5c06d-64ad-4bb9-b50c-cca8989845a2/fotukawapufiriwizafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb30d838-04e2-4494-a666-7d2646fbb98f/used_shopsmith_scroll_saw_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd15b1d-d56c-4b98-9ab5-b8235ba91302/what_is_brene_brown.pdfIn 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_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 5392 bytes
SHA-256: 02337b040e6a7a25a06e8dc0430c0bda51e9fa831c3b7f6833b6fa488823c77e
font_01_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 5144 bytes
SHA-256: 1a04419a4d1faece8a211aac49c0b8ac6f65da9694c830487228ab07d28319d4
font_02_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 11224 bytes
SHA-256: 78030eb9002e3c26fe33b73ac47920e1d5493b7210ad2135f189044e353497d2

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