Malicious PDF — malware analysis report

Static analysis result for SHA-256 2edb2d10f93528b2…

MALICIOUS

PDF

84.1 KB Created: 2021-04-02 20:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8fc68f0ad06629ceaa382ae29b72a9eb SHA-1: 1370b7350b58ad3b203adb307b709082c785531c SHA-256: 2edb2d10f93528b281739ba4442559cd467c6cc0d44ea4cba1f6b26fde3475ab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9994

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://dafemum.ru/strik?utm_term=history+of+the+world+in+6+glasses+coffee+summary PDF link annotation
    • http://dkmz2.club/26732016415gxtop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421937/normal_5fdbd07f283f7.pdfIn PDF document text
    • http://topsalon.xyz/audio_technica_at_lp60_usb_needleuzwfu.pdfIn PDF document text
    • http://wutanitof.22web.org/masanosi.pdfIn PDF document text
    • http://wow50.pro/functional_programming_simplified_scalafe6vn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424364/normal_5fcbe6519ce7d.pdfIn PDF document text
    • http://keepmaxi.space/word_attack_two_player_gamescnko3.pdfIn PDF document text
    • http://blue-tick-central.com/intex_saltwater_pool_pump_systemkalx1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_60628d9426d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_603ba15c301ce.pdfIn PDF document text
    • http://fc-aromat.ru/mizesezikokorer3pz7c.pdfIn PDF document text
    • http://pubgucbayim.com/lutawowutazevupizareacm.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/iffcChe/pixilulatumememuf.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/aAgfXjf/werewolf_online_see_all_roles.pdfIn PDF document text
    • http://usejus.club/rofivefagojagenicx0a4.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/belopudevuzuza/can_you_purchase_a_modem_from_xfinity.pdfIn PDF document text
    • http://kisolapuri.rf.gd/spider_man_homecoming_movie_in_filmyzilla.pdfIn PDF document text
    • http://tiwobera.rf.gd/carrie_carrie_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/82098501317.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/76933204841.pdfIn PDF document text
    • http://nufitexevav.rf.gd/neel_akash_bulbul_song_free.pdfIn PDF document text
    • http://newubopuga.epizy.com/31304179627.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/autodesk_design_center.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_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 5744 bytes
SHA-256: e66e0e2c5474c1d3f1f031519063bce39711ed477ed57f536125779c9e978856
font_01_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 10768 bytes
SHA-256: 19bf4ea7b2c7a02c40dbf1edef565677a100610f14cfcd09ab937762ccf5772f

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