Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db0c6e1269866d3…

MALICIOUS

PDF

82.4 KB Created: 2021-04-03 18:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ecb306f92fce47b527a4f2ebf4ae2c21 SHA-1: 508f890b23a1621174cb39fc96a4e2b09f87c66f SHA-256: 3db0c6e1269866d3c658475047b9792e94d3c4985a5468dda5171feb0fe4e469
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 0.9996

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://kuzutuzo.ru/award?keyword=synonym+dictionary+oxford+pdf PDF link annotation
    • https://cdn.sqhk.co/tejilunuf/iK28hiE/hotstepper_lyrics_bexey.pdfIn PDF document text
    • http://blognews.top/brian_mcknight_marry_your_daughterh6chz.pdfIn PDF document text
    • https://cdn.sqhk.co/waxusuxagaki/i2hvHje/moxivijufafigudem.pdfIn PDF document text
    • http://probmaka.tech/04_dodge_1500_lug_patterngx536.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/jfjd73g/ncert_solutions_class_10_maths_ch_5._2.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/eyijnFm/hepatitis_b_transmission_routes.pdfIn PDF document text
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/2921688.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/ggyfAKj/741732945.pdfIn PDF document text
    • https://cdn.sqhk.co/faxonudogot/hjMYJji/heartbeat_listener_apk.pdfIn PDF document text
    • https://rapexukiwivusa.weebly.com/uploads/1/3/4/8/134856806/vabekanumadezi.pdfIn PDF document text
    • https://sutovuwoti.weebly.com/uploads/1/3/0/9/130968995/c8220de312.pdfIn PDF document text
    • https://jevilorusijugif.weebly.com/uploads/1/3/0/8/130874204/kamuzudinel_mibimifuligame_gegapaporomo_tevobamume.pdfIn PDF document text
    • http://mailedflkf.site/61681316212uzkme.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/cjggihd/45671316896.pdfIn PDF document text
    • http://idclick.cash/common_core_standards_ela_11th_gradeiw5ty.pdfIn PDF document text
    • https://cdn.sqhk.co/dosijowikul/ghqihat/jowidukuxakarosalekonezi.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/gfjiG67/41151434061.pdfIn PDF document text
    • https://senevilamopon.weebly.com/uploads/1/3/0/8/130814687/tefipu.pdfIn PDF document text
    • https://muvoletad.weebly.com/uploads/1/3/4/6/134642496/levumamafog.pdfIn PDF document text
    • https://cdn.sqhk.co/xedasuzefer/zXjNhhX/lep_s_world_3_download_free_for_pc.pdfIn PDF document text
    • https://xedagiwaki.weebly.com/uploads/1/3/1/8/131856626/b21b6b3.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 5364 bytes
SHA-256: 658d73f7675db558192594a88f0c1d660dd64e16a13e6cfcecc461b63f0f218d
font_01_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 11396 bytes
SHA-256: ab54088b88877f3b02211a9cb57178cc1807cb43c2ff6a8b1e62af9f4c2d6ca4
font_02_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 16544 bytes
SHA-256: 8d45f5f417e74c11d54eaee7138901bb4b2498e40dea16ccf89f2c2707c13e35

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