Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40a08ada29c9528…

MALICIOUS

PDF

71.3 KB Created: 2021-03-02 13:38:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 581831694dc7d203969f533a2442ac52 SHA-1: 459c754f7c5a8ceb96e70e2774f43b01726fa9cf SHA-256: c40a08ada29c9528af5eb3a7514e9d73c801759a7ffa0c4688fe521a6d62578a
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting or potentially malicious domains, consistent with a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/wix?keyword=two+nonmetals+forming+covalent+bond PDF link annotation
    • http://gilumesu.mypressonline.com/12427643756.pdfIn PDF document text
    • http://airned.ru/170481541drzh5.pdfIn PDF document text
    • http://digitalmedialit.com/jujaxonexikufewetolafuj2qihs.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/iihcJey/80_s_trivia_game_questions_and_answers.pdfIn PDF document text
    • http://snt-br.ru/ruzidupopuxmzhq.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/whc3hbj/relics_of_the_fallen_roguelike_card_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_60337f7532f4e.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/sAgj1qO/75964593724.pdfIn PDF document text
    • http://vienvozvrat.site/who_is_bruno_friend_in_the_boy_in_the_striped_pajamaszy542.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/what_is_the_theme_of_chronicle_of_a_death_foretold.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_6023db6565b16.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/60559751153ffj4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_602b226c69bea.pdfIn PDF document text
    • http://amsidisi.xyz/vmware_player_14_toolsp39sc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447108/normal_5fdf92bb7b095.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lilepav.rf.gd/seron.pdfIn PDF document text
    • http://dikokek.epizy.com/zamenadatogokufuba.pdfIn PDF document text
    • http://lobakixadob.epizy.com/75105509133.pdfIn PDF document text
    • http://mabukivo.epizy.com/brain_teaser_worksheets_for_second_grade.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 5584 bytes
SHA-256: acf667df9c621b070e8413cb7997ddc51b6394c1b3d75f6a2400cc8c65842ed0
font_01_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 9900 bytes
SHA-256: 548d3b938a24aa367fd39f4f7a17d4147e34fb6a13995078d281c6be9b2881db

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