Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1deb91f7d40fe03…

MALICIOUS

PDF

65.8 KB Created: 2021-02-16 05:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fd1bd5b085b7d4bf7abd50c2a6e4e310 SHA-1: 51c0cd09f4f20fd8423d7a92f346de2210266d77 SHA-256: e1deb91f7d40fe03cb143335f580f5417d9e49780b970a0e01ff4ef873da5eb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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
  • 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://leonvi.ru/123?utm_term=zagg+folio+tablet+keyboard+case+for+ipad+air+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451762/normal_5fdb76f0a026c.pdfIn PDF document text
    • https://kasezikibojeg.weebly.com/uploads/1/3/1/8/131871727/1284cec80.pdfIn PDF document text
    • https://cdn.sqhk.co/gedodupem/hYRRdhi/slow_motion_video_editor_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492294/normal_5fdbcec2a93ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488141/normal_5ff16ca14e2d9.pdfIn PDF document text
    • https://nevipezuke.weebly.com/uploads/1/3/4/6/134652321/607217.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/hf4Gdgd/the_boy_s_book_of_adventure.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/TbAtbia/rock_and_mineral_show_denver_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/7whigdu/ludo_snakes_and_ladders_board_game_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367959/normal_60054684d0d9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sugototuvomek.rf.gd/oxford_english_dictionary_format.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/98082789766.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/song_achha_ji_main_hari.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/ansul_piranha.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/bhangra_ta_sajda_song_mr_jatt.pdfIn PDF document text
    • http://jejivosijej.rf.gd/11025977471.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/95447659154.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/malwarebytes_anti-_malware_windows_10.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_off0000c339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC339 5716 bytes
SHA-256: f1f438923dc7e0f1a1ba0b17a4ed0f09b8ede8b2d554ec52ab56861ec92ae5c6
font_01_sfnt_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 10216 bytes
SHA-256: d1d26db58d67eda43e86d385657e66c326b99af294625ac43cb20f0242ce98f7