Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f806238ca8867c…

MALICIOUS

PDF

81.2 KB Created: 2021-03-28 00:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d514ad012cd10ceb1969a2a470ac9636 SHA-1: 9e70e158c8fbcc15fd4f5a7db63b6c488590c683 SHA-256: 40f806238ca8867c51381fe9346d53d4f6b2b800a4b861c3866c491d2e5befb7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, identified as a 'PDF_SEO_LINK_FARM' and 'PDF_SUSPICIOUS_LINK_LURE', directing users to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jacksth.ru/strik?utm_term=what+is+the+difference+between+ac+mode+and+simv+mode
    • https://cdn.sqhk.co/dasadogiso/zjjkOEz/watch_live_streaming_nba_tv.pdf
    • http://citrus-fruit.space/how_to_drain_a_caldera_hot_tubkrjt7.pdf
    • https://cdn.sqhk.co/bepeguvovori/EbggYhs/coloring_coloring_pages_to_print_lol.pdf
    • https://cdn.sqhk.co/vobipibomuk/iXhiAT7/car_racer_salary.pdf
    • https://cdn-cms.f-static.net/uploads/4501041/normal_6011deb2c4cdb.pdf
    • https://cdn-cms.f-static.net/uploads/4497344/normal_605ccc74961fa.pdf
    • https://cdn.sqhk.co/raguwubives/dTjfAif/85341291522.pdf
    • https://static.s123-cdn-static.com/uploads/4375890/normal_5fcaed1e9edac.pdf
    • https://cdn.sqhk.co/pujazojiwixi/ZhhP6hg/lucky_skyblock_mod_download.pdf
    • http://loginwithfb.site/4021398092443g0o.pdf
    • https://cdn-cms.f-static.net/uploads/4490950/normal_604db14b84837.pdf
    • https://cdn.sqhk.co/gabazumad/ChtihSF/friend_finder_reviews.pdf
    • https://cdn.sqhk.co/rawavuzom/jhjOGhf/sofudujodi.pdf
    • https://static.s123-cdn-static.com/uploads/4492555/normal_5ffac0362a23c.pdf
    • https://cdn.sqhk.co/zobazulibes/eHhjjfG/phage_display_library_construction_and_screening.pdf
    • https://static.s123-cdn-static.com/uploads/4368469/normal_5fdef44cc76c5.pdf
    • https://cdn.sqhk.co/miwavilusaji/ihjibne/send_anywhere_file_transfer_how_it_works.pdf
    • https://static.s123-cdn-static.com/uploads/4388289/normal_5fde5711bb605.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_02e4002ef2d64dddbe7d450667026c35.pdf?index=true
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_bde3dfdd5ba0467bbc7b6553fe91448b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb42.bin
d4d06e1e1d8f694d54b6cca0ea088560bb12161936912e534a2398f094708c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 5532 bytes
font_01_sfnt_off0000fe02.bin
7f40766afc658a749bfa016b353b3ce5fba29b7f4073cd930eee5bb962e32887		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 10476 bytes
font_02_sfnt_off00012215.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 16060 bytes

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