Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cd2a9e1915c735…

MALICIOUS

PDF

94.2 KB Created: 2021-03-15 18:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a353d590aeb1a63394ed34527ecaefb SHA-1: 5ccef73214239205ee78edfedcd98406ddf8b410 SHA-256: a7cd2a9e1915c735c199615ab390d861f3b7599b0e6157bd52ebafcb178e2686
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that mimics a search result for 'muscle building exercises for beginners at home', likely intended to trick the user into clicking it. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to a malicious site, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://ponafet.ru/aws?utm_term=muscle+building+exercises+for+beginners+at+home
    • https://cdn.sqhk.co/pidodalatip/Mhgie7T/grow_financial_credit_card_phone_number.pdf
    • https://cdn-cms.f-static.net/uploads/4480893/normal_6044780752e4e.pdf
    • https://cdn.sqhk.co/raxoxawupej/D6idNhe/nhl_21_ps5_compatibility.pdf
    • https://static.s123-cdn-static.com/uploads/4483591/normal_60089a8741cbc.pdf
    • http://milansit.space/kuduxudodawikabajepusinujd6g7j.pdf
    • https://cdn.sqhk.co/sufadoma/dDehd6s/tabletopia_virtual_board_games.pdf
    • https://cdn-cms.f-static.net/uploads/4409258/normal_604919a411ce4.pdf
    • https://static.s123-cdn-static.com/uploads/4462985/normal_5fe4144a8b5f7.pdf
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5fdc6b4b3e946.pdf
    • http://lightly.store/pumabupavfucf.pdf
    • http://moitender.org/janasheen_mp3_songs_downloadcpfmy.pdf
    • http://canonsburglake.org/power_pressure_cooker_xl_cooking_ribsiak7l.pdf
    • https://cdn.sqhk.co/panosiritu/jeGjfJ3/english_songs_90_lyrics_2019.pdf
    • http://salebox.shop/dependent_versus_independent_variable_worksheethn4p6.pdf
    • https://cdn.sqhk.co/tijanukubo/YhcucR7/filibajoxatob.pdf
    • https://cdn-cms.f-static.net/uploads/4390681/normal_600bb78223182.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bejikefowu/bait_full_hd_movie.pdf
    • https://s3.amazonaws.com/mivokozibu/offshore_fishing_report_delaware.pdf
    • https://s3.amazonaws.com/tokafanawa/berapokepe.pdf
    • https://s3.amazonaws.com/jijari/city_of_calgary_recreation_guide_2017.pdf
    • https://s3.amazonaws.com/rejiner/appraisal_answers_for_managers.pdf
    • https://s3.amazonaws.com/jikopot/vezuwurexeboritexis.pdf
    • https://s3.amazonaws.com/wefadep/geometry_equations_for_circles.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012586.bin
4d04bb857af78703e6d354b29fbf57e9e4bca8efffebe91555536aae4ea3a6bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 5528 bytes
font_01_sfnt_off00013822.bin
d558051e1d44e3ecfe240ee54e0df994076c96587ccacbe9c7cb62b3869aad43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13822 11040 bytes
font_02_sfnt_off00015dd1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD1 4324 bytes

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