Malicious PDF — malware analysis report

Static analysis result for SHA-256 e451f3c95fd5164e…

MALICIOUS

PDF

83.4 KB Created: 2021-03-14 01:16:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3f8b498807607c036df5ff083e1b457 SHA-1: 08153fc9ecb4eb45fa4b3d52f00a44e4d6c97e77 SHA-256: e451f3c95fd5164ea3c673d32d488ccc854537a0da189729e30225a9e80a2565
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to potentially harmful sites. The presence of a URL with 'utm_term=counter+strike+1.+6+offline+pc' indicates a lure to attract users searching for game-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=counter+strike+1.+6+offline+pc
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/a5df21eba.pdf
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/zuzajef.pdf
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/zabosunigexoboma.pdf
    • http://nulivanofika.mygamesonline.org/54053964168.pdf
    • http://nenegifivujaxu.mypressonline.com/acute_leukemia_treatment.pdf
    • http://risonubokedoxav.scienceontheweb.net/5022917666.pdf
    • http://eroganoficial.site/canon_canonet_ql17_battery_check50di2.pdf
    • http://wiinorama.fun/16310957789sxqxq.pdf
    • https://xozipirun.weebly.com/uploads/1/3/5/3/135324749/dosotepimaluna_detekeno_magijuga_lopuzo.pdf
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/318743.pdf
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/bewimeli.pdf
    • http://arfesopt.com/honda_hrr2168vka_parts_manual1o1vf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4439a0b5-031c-42c0-b9e8-fcc75b393707/whirlpool_washer_not_spin_drain.pdf
    • https://4694dce0-4d1e-4c77-b4da-d1f025f82355.filesusr.com/ugd/fb332b_e8ef06d32c89420da7e5fc4cea572e97.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fc8359a4-9adc-4881-b6cf-339874451225/crossfit_exercises_list.pdf
    • http://rawigukegopafot.onlinewebshop.net/50141205303.pdf
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_9d954cdc6dfc4c9b85b5bb7a7d056560.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f967.bin
e75dfd3f5ffa133b040c5dca435c52a9d674cbc2dc1222ac60ab785b148b0530		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 5004 bytes
font_01_sfnt_off00010a93.bin
76cc06abf68cc4e63d74b1c57e9a3a6731b44cedbf7ac000dbf5c76e88d210a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 23472 bytes

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