Malicious PDF — malware analysis report

Static analysis result for SHA-256 903593191c82cfd6…

MALICIOUS

PDF

80.8 KB Created: 2021-03-24 06:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c44410114de74b9eac413616169430e6 SHA-1: 9c5d3ddf723a375e339bfd353c3a8d0cf43e57bb SHA-256: 903593191c82cfd6e9222fe3c986545e1676881160015de03fad3aec285a14e9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wix?keyword=photoshop+cracked+mac+reddit PDF link annotation
    • http://rejemezurufoveg.mywebcommunity.org/wideralogen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410695/normal_602d365fa4737.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/sufazilapodetigukebo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410694/normal_6001e1a3f3466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_6028ead601727.pdfIn PDF document text
    • https://cdn.sqhk.co/vizejagojib/9liiL9m/shooting_games_for_ps4_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_602454a799e3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_604073705c0b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_6015fedb0c626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_6058d0830ebd9.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/a0je8zv/zixigonesawilolat.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/jixeremipet/lagu_brain_damage_eminem.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_64b5cdce684843b8a3c79a0661c11db3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/sexual_vs_asexual_reproduction_worksheet_answers.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_77510af896394914a63f255639086bf5.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_1e1aa1b39c684994a2eda9db6c409517.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/mikavuf.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/samsung_android_9_show_battery_percentage.pdfIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_d8f730d5bb6f4efe9d5b1298d0d2baf0.pdf?index=trueIn PDF document text
    • http://namakanexir.atwebpages.com/national_oilwell_varco_mechanical_engineer_salary.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_d0bef47c03044c8b8fb277ab51374fb9.pdf?index=trueIn 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_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 5344 bytes
SHA-256: 6c92ccdba6d80174e858516b2cc0289ebeac70f264f8c246fab5b6cc218ebaf4
font_01_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 11872 bytes
SHA-256: 3c3094bec5a73777f63c884c83124603c4f41edc208d7540561de725ee4a78b0