Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8715e8b4ad0a92a…

MALICIOUS

PDF

76.3 KB Created: 2021-04-12 18:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8060ce5eb948d053d35c45830aca87ab SHA-1: ca557a2ab099bc5629e9252c0dc372abf4787a7d SHA-256: e8715e8b4ad0a92a05522d54b980237077804aa577c784012631fc061dd7e8b7
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with the primary malicious URL being https://dugedepap.ru/strik. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests the document's purpose is to redirect users to potentially harmful websites.

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://dugedepap.ru/strik?utm_term=7.3+zf5+4x4+transmission+for+sale
    • https://cdn.sqhk.co/vedoreket/3iMcehg/akhiyan_new_song_neha_kakkar.pdf
    • http://krokoboko6.xyz/galaxy_on_fire_2_hd_all_shipszkzyl.pdf
    • http://feyakast.online/dynamics_365_for_finance_and_operations_development_cookbook_downloads4nvo.pdf
    • https://cdn-cms.f-static.net/uploads/4414335/normal_6049bc8e011dc.pdf
    • https://static.s123-cdn-static.com/uploads/4388432/normal_5ff925f5cefec.pdf
    • https://cdn-cms.f-static.net/uploads/4365619/normal_6061c4dbc2a45.pdf
    • https://cdn.sqhk.co/jekuzedu/hiXjdKU/best_piano_lessons_for_beginners.pdf
    • https://cdn.sqhk.co/xidujefonari/iihg46v/70310304158.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duxurulokij.epizy.com/15010968714.pdf
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_6056a97e42124f47a2b2213f7dafdd31.pdf?index=true
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_0e009199a37e4e02aa9061248415c962.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a7c21e95-8d5a-44de-86a3-3fa9c6dfbcc2/what_is_difference_between_subnetting_and_supernetting.pdf
    • https://uploads.strikinglycdn.com/files/1d006bbe-ac84-4735-8f11-e3b4fbb9448e/company_of_heroes_movie_imdb.pdf
    • https://uploads.strikinglycdn.com/files/e76f82a7-58db-44ba-8656-739b7c1b6be5/totufefi.pdf
    • https://uploads.strikinglycdn.com/files/bfe84592-5842-4407-be7f-cccc0890a7c0/52421402789.pdf
    • http://viziboxovuw.rf.gd/92018614000.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_off0000eb26.bin
eb77344ec9df1b31efb3e64cf011d081cc74e290af50fe9ab7253e49f5905bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 5424 bytes
font_01_sfnt_off0000fda9.bin
7c0829660509c7683173e817313ee956927204ee73a73953c8c0be135264dd5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 10792 bytes

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