Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a6c73efd3a2d5f…

MALICIOUS

PDF

87.3 KB Created: 2021-03-30 04:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3475c8cdaffe51b47d78ff7f8f146d86 SHA-1: 575fd1007210f82d6a1ea868d679082449e8d2a4 SHA-256: 02a6c73efd3a2d5f27444ed73074ee480038b5d450abba1aea7a1c0f25072b06
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one pointing to 'vilenefex.ru', suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vilenefex.ru/strik?utm_term=the+monkees+daydream+believer+episode
    • https://cdn.sqhk.co/ronuwimo/fahIAgj/addition_flash_cards_math_help_learning_games_free.pdf
    • https://cdn.sqhk.co/nufesewepi/fiaibgd/sozeburukesife.pdf
    • https://cdn.sqhk.co/puxolika/bsvjaeC/xenekebozu.pdf
    • http://juzezudusota.mypressonline.com/getodovasijopudututirami.pdf
    • https://cdn.sqhk.co/bidogefapo/eiea6ic/fitness_bodybuilding_apk_download.pdf
    • https://cdn.sqhk.co/womawuxinuge/cid5jig/guitar_hero_rock_band_3_song_list.pdf
    • http://wafowufopenu.22web.org/jekhane_bhooter_bhoy_bengali_full_movie.pdf
    • http://nizavevorupuj.mywebcommunity.org/convert_webpage_to_on_ipad.pdf
    • http://negisalipividul.iblogger.org/zoguzufakesodibedolo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xujided.onlinewebshop.net/wagexofinirafamupomil.pdf
    • http://bazokupakem.epizy.com/nedesuzeraduxiki.pdf
    • http://japubonaxepesi.rf.gd/rakanitaxogemosodusixive.pdf
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_d54ab817144642bf9f92459a52930b5f.pdf?index=true
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_9a6c02f95ac741b3be1e42390f050c2e.pdf?index=true
    • https://s3.amazonaws.com/zuvovoxigumuz/81129750837.pdf
    • https://s3.amazonaws.com/tokafanawa/vamitomebaj.pdf
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_56a9e79e5a424db6bc6565054b9fd341.pdf?index=true
    • https://s3.amazonaws.com/sizabo/20980999806.pdf
    • https://s3.amazonaws.com/fakuguvil/monomial_multiplication_and_division_worksheet.pdf
    • http://gamupuzif.epizy.com/50661567998.pdf
    • http://sazevaxorofezag.epizy.com/57815115341.pdf
    • https://s3.amazonaws.com/tiniruru/84697840327.pdf
    • http://jumawudoped.rf.gd/96820416964.pdf
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_3260b87fb02c424fbe8850bfaf616f81.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ab.bin
f909e628d67bd32b44d4ef300b5293a164daeeff5d4def12c9716e62c9b9ba2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 6400 bytes
font_01_sfnt_off000116b5.bin
7897f8ad62c02264ed935ac4cefc437f5b393231f92ca7ffe9a029598df5e0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 5516 bytes
font_02_sfnt_off0001294a.bin
4e33eeb2b54ae655aa36d363f019fc7df65c756ff62d66df3ab275311ff9e393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 10980 bytes

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