Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa0c18531d6c41b…

MALICIOUS

PDF

82.8 KB Created: 2021-02-02 12:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d6cce734e9c7000c2fa85d5a1de48873 SHA-1: 735031bd54184ee5163788844fc3ec64ec2a6414 SHA-256: 6fa0c18531d6c41b6c75ae02993dd75533b81128dad58d75745c0f67456d977d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, aiming to direct users to malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=texas+roadhouse+employee+policies In PDF document text
    • https://cdn.sqhk.co/vibebexez/vYif74S/tuzalisejuvabowuru.pdfIn PDF document text
    • http://yogist.fun/lidawusamaronidarotajurnjxz.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/HUKjiED/cowboy_good_morning_picture_message.pdfIn PDF document text
    • http://onsideball.info/techcrunch_extra_crunch_live9qjjy.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/v5jS8jh/world_war_series_fanfiction.pdfIn PDF document text
    • http://world-wild-shop.com/xiniliwaxuwefexalivepolemhhz0.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/iciaghR/gang_clash_game_guardian.pdfIn PDF document text
    • http://presentinsta.online/general_aptitude_test_papers_with_answers_docxhmte.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/geOjdhe/kadurupujofivig.pdfIn PDF document text
    • http://help-mediasupport.com/fepowoxosezobejulopewaprxs.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/dxjiERO/snake_3d_java_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/keviwebewuta/el6jeC8/48494195789.pdfIn PDF document text
    • http://medtechnika1.ru/shogun_rua_record_ufcej02b.pdfIn PDF document text
    • http://creamwalls.space/fafujofozozojojivan3mrr6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 3216 bytes
SHA-256: 6d9a7e42bc4344f8813a6a12353c44d247c84f7033a907d3657521fd0f5860f4
font_01_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 5432 bytes
SHA-256: 3e03f146ecc4abd38ae539ebb86c0d8de7d77f3355cc0c0abdbf8e48d0920e5f
font_02_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 11392 bytes
SHA-256: 0cc88219ced0083e181cc0357efecdcc6ccaf446a26455dfbe96ec95d77a566c

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