Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5240a038ace00f…

MALICIOUS

PDF

69.5 KB Created: 2021-02-15 07:00:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 98f510d0a8f699f4a5abd5ddc696290e SHA-1: 6a6665a8edd1a6bec39a1b66cce90bd81d2fd7a5 SHA-256: 3f5240a038ace00f3fdfdf35daf471902c2d02837115f2f4372b6657e5f231fe
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. This URL is likely used to lure victims into downloading further malicious content or engaging in phishing. The document also exhibits characteristics of a link farm hosted on disposable domains, further indicating malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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
  • 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/wb?keyword=century%20gothic%20google%20font%20free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_6013798dacae8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460706/normal_5fe317d900635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451208/normal_601ed18f13320.pdfIn PDF document text
    • http://guwilos.iblogger.org/explain_latter_and_former.pdfIn PDF document text
    • https://cdn.sqhk.co/wesifarajaru/ifZhdxl/red_ball_evolved_level_11_walkthrough.pdfIn PDF document text
    • http://insta-sale.site/8198357848710mfb.pdfIn PDF document text
    • http://fortuneo.biz/final_fantasy_tactics_pc_modscsmdu.pdfIn PDF document text
    • http://buzosidatiwe.iblogger.org/tabletop_simulator_d_d_5e_character_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/ggjiiBB/feisty_definition_synonym.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://miviguwi.epizy.com/guwuxovezipipepupob.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/6658339934.pdfIn PDF document text
    • http://lizaduguxo.epizy.com/sheet_edge_deburring_machine.pdfIn PDF document text
    • http://bekekujizaduk.epizy.com/google_sheet_pivot_table_update.pdfIn PDF document text
    • http://lekipuvuji.epizy.com/wojuxurujulo.pdfIn PDF document text
    • http://giwolexuki.rf.gd/avatar_3d_digital.pdfIn PDF document text
    • http://xikisefux.epizy.com/psychology_research_paper_topics.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 4764 bytes
SHA-256: fc53621c350e64324559e4012a8a91a9d30d06301616a90b019606459e8e07ff
font_01_sfnt_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 9956 bytes
SHA-256: 7d2b96ac4797114d0f0f6486cb6c5a77a7c82f7decdf4b82923a03463ed0cffc
font_02_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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