Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9052f009865622…

MALICIOUS

PDF

71.5 KB Created: 2021-03-02 11:04:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 551b1359d9e7fe5a5efd707339a19442 SHA-1: af4aa4229883ae4f5a10761debe2aadd30c1b658 SHA-256: 4e9052f00986562287703860a399a1ff7f7ae5a0846748896e85476cd0abccd9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

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://golowaki.ru/strik?utm_term=how+to+write+a+letter+of+recommendation+for+a+medical+student PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470400/normal_601dcfb97553c.pdfIn PDF document text
    • http://resusawoka.iblogger.org/fearless_album_songs_taylor_swift.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/pbhhpNA/time_management_synonym_list.pdfIn PDF document text
    • http://kuxalowakanuxed.iblogger.org/invoice_templates_printable_free_word_doc.pdfIn PDF document text
    • http://sadanojigoma.22web.org/webkinz_jelly_bean_challenge_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/aIsiipk/21312699685.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471230/normal_5ff143600b62d.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/iAidicz/goblin_defenders_2_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/b7U76je/subway_runner_princess.pdfIn PDF document text
    • https://cdn.sqhk.co/tesolivu/hdih1jh/how_to_decorate_a_cake_with_icing_bag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420013/normal_602fe2d41f4aa.pdfIn PDF document text
    • https://cdn.sqhk.co/gugosobor/bhfmigB/luno_bitcoin_wallet_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/ighcAgh/copd_oxygen_level_below_90.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/ieheEje/jisapulijurerovugexidef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/salade/50806554421.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/nawedivoxividu.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/kurinivizegoziru.pdfIn PDF document text
    • http://rebamasisagu.epizy.com/20004169625.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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 5220 bytes
SHA-256: e051872a5d435e03e7efa133dc9be09146baea9f5fdcdf93d1c049d470294ba7
font_01_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 9876 bytes
SHA-256: 4f2a1a0523185c3f22cb87c0f64a1488802c6521f8cbe6c865ab560d774041f4

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