Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbed393debc0afd…

MALICIOUS

PDF

78.0 KB Created: 2021-03-29 13:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6db76d419ec7f9d5a25c4e0b826dd488 SHA-1: 923d41f715261a6d3342e746e1e241a6d585bdf2 SHA-256: 2bbed393debc0afdff1c3ec32c8b12f89434728043ff20f1f72d92d2e08ac666
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 0.9992

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://vilenefex.ru/123?utm_term=bleacher+report+mock+nba+draft PDF link annotation
    • https://cdn.sqhk.co/muligumixe/7giiEzF/45816243414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_6014b65e9789c.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/ligabutotuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/1sQFtpc/domupogalunoletirumememi.pdfIn PDF document text
    • https://nigenodesi.weebly.com/uploads/1/3/4/4/134480521/2248322.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/DGgfLQY/i_am_warrior_quotes.pdfIn PDF document text
    • https://toxinezewam.weebly.com/uploads/1/3/1/4/131452950/razutofenopipi_soxarifubumegim_jijekirefexe_moreta.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/Qphbics/diastolic_blood_pressure_definition_medical.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/88e8dc4d.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/d1tJb7N/the_elder_scrolls_legends_card_backs.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/ezegehe/the_floor_is_lava_host_death.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473340/normal_5fd770734cef9.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/e8645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_60380285b215a.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/drcRig3/18699936979.pdfIn PDF document text
    • https://cdn.sqhk.co/pulovafafita/2heRBjh/kung_fu_rabbit_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_605d79e946561.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366003/normal_5ff5f3560f8b9.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/ji6hhFN/13235379178.pdfIn PDF document text
    • http://ladirojenovezoj.mygamesonline.org/12734702940.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://getetir.epizy.com/central_machinery_12_speed_drill_press_parts.pdfIn PDF document text
    • http://jixoxila.epizy.com/list_of_irregular_past_tense_verbs.pdfIn PDF document text
    • http://gagolabirej.atwebpages.com/44284044188.pdfIn PDF document text
    • http://soxenaroguz.rf.gd/wamebalirujefukifitewu.pdfIn PDF document text
    • http://kuxejerudaxis.rf.gd/ccdp_book.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_off0000f594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 5468 bytes
SHA-256: 188aa41d6518a7bb90a31628b00dd44ab3733cc52dcc1c2c377e5a2e2f792a16
font_01_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 10216 bytes
SHA-256: 2ee8244d5fe713c312fa9ebc517129ee40f74557980d157fc1f36769b0100ad6