Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca72f7860e26017…

MALICIOUS

PDF

74.1 KB Created: 2021-01-24 21:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d57ed211e55bdb0d01200201cd1befbf SHA-1: e89be2321260d88d90160ab959a06cd1067b1d58 SHA-256: 9ca72f7860e260170f34d1eef2783dfb401ea60084d09727106ef2701ed1f1dc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these numerous external URLs.

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://seumenha.ru/123?utm_term=march+mammal+madness+2019+bracket+pdf PDF link annotation
    • http://dmgameplan.com/36547761462vmuvy.pdfIn PDF document text
    • http://salonvarna.com/295991744917bhn4.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/chfJige/facebook_marketplace_morristown_nj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_5fd8d1734dd34.pdfIn PDF document text
    • http://proflist-briansk.ru/head_ball_2_game_videopsvxh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482228/normal_5fec50ef3e58a.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/e9VkNyQ/my_talking_kitty_cat_apk.pdfIn PDF document text
    • http://copyrightprivacy.site/suzakivumsa05.pdfIn PDF document text
    • https://doxezudira.weebly.com/uploads/1/3/0/7/130739714/d3c1d1e64da.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/daa50.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/hFLe3ii/cruise_out_of_galveston_march_2020.pdfIn PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/97224bbe583.pdfIn PDF document text
    • http://bestgirl69.com/auto_background_changer_apk_downloadxt3e5.pdfIn PDF document text
    • https://cdn.sqhk.co/pusuvizodez/ETifghp/gfi_hound_dog_dashboard.pdfIn PDF document text
    • http://pagebake.com/foravanizufepyrln4.pdfIn PDF document text
    • http://axecheat6.xyz/86306031130tfh7f.pdfIn PDF document text
    • https://cdn.sqhk.co/wefopijupe/clNhe5X/drawing_board_app_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/jbihq6o/30066914229.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/7jbhdln/37422908845.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367656/normal_5fd07b63b710b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcf61d14b923.pdfIn PDF document text
    • https://gakatonigi.weebly.com/uploads/1/3/2/6/132681340/fenedevawim-ratewuguviseto.pdfIn PDF document text
    • http://good-production20.site/clash_of_clans_private_server_apkyzr6g.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 6088 bytes
SHA-256: 691eb43af550d324010bb9de42b4738a892ad2491d798299f81bf120c15f31d3
font_01_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 10876 bytes
SHA-256: 5e0b128ec137f5e68d0ee60ab4b1629e32006ae1bf0407adf2f4110ed9a392b9

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