Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec36a368e38ac2a…

MALICIOUS

PDF

103.8 KB Created: 2021-03-27 12:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 443ecf033fdea6cdab6a65da2260dfa7 SHA-1: 477d5411a657820e2b0971a0920f266fc888f88c SHA-256: 2ec36a368e38ac2ace18a50d062f861e7dd8fb88fe4d0fe39af5cef09d8137fe
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/wix?keyword=asus+rog+crosshair+viii+hero+drivers PDF link annotation
    • http://biniwitovo.mywebcommunity.org/pepelavul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382973/normal_5fc5db7173c9b.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/jdjjZjg/battleship_board_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/heiiahc/cytus_2_miku_glitch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_6018e688de190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5ffd9dfce829e.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/tLjf5hj/final_fantasy_7_walkthrough_remake.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/28296890158.pdfIn PDF document text
    • https://cdn.sqhk.co/texirisawoz/jdN1yGg/97890383689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_6019ff1d63dd9.pdfIn PDF document text
    • http://vosojivaru.mypressonline.com/pawobexu.pdfIn PDF document text
    • http://wojisub.mypressonline.com/what_was_book_series_box_set.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464700/normal_601bb3ef5274f.pdfIn PDF document text
    • http://gapijet.scienceontheweb.net/what_is_gods_name_in_the_christian_bible.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/IIjdhcu/xikuduvolikedowemoxizeta.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/WhbhjUo/31719808596.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/jgicqLc/i_peel_good_game_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_5fe7cac917a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459185/normal_6010e92ccd967.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/QTfBGhh/olympic_game_1983_cheats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_b1edde3931f243b49f2ce8f2416ebf10.pdf?index=trueIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_6b3a7f83e1174f8a936569a843334ef3.pdf?index=trueIn PDF document text
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_f1ec7615516b48f1848dae5ce71cc0a3.pdf?index=trueIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_02e7b1d931ff4616b8b05141a1de1323.pdf?index=trueIn 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_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 34848 bytes
SHA-256: 5ac292f957645bd1eb8957f0b171c02c9fcabf75714fc3f9ef009ddc2da2ab40
font_01_sfnt_off00015955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15955 5220 bytes
SHA-256: 0b073c2ecc9762c32d96cd40b63813f686d4f47d45d55a043d4369750c9b694c
font_02_sfnt_off00016b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1A 11152 bytes
SHA-256: 94211a40d108a08dde40b9fd0feeec5a64511c6f14d5baade93e4172dae32aba

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