Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c4a6dfaabc32f8…

MALICIOUS

PDF

91.1 KB Created: 2021-04-25 10:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1488de5c002652905f975aa8f17a7ce1 SHA-1: dd377f2e5ba8416441d1657903135921dc2f663d SHA-256: c7c4a6dfaabc32f85a7a5a687d356d55e094d5c5f3c644321d92ca3cf26e87fe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'kuzutuzo.ru', a domain flagged for malicious activity. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute traffic or host malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The embedded content, though heavily obfuscated, likely serves to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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
  • 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/strik?utm_term=who+is+the+number+1+hero+in+one+punch+man
    • http://govuxojikasumot.scienceontheweb.net/inoculo_bacteriano.pdf
    • http://zagejudivavi.sportsontheweb.net/human_anatomy_nervous_system.pdf
    • http://kadesevi.iblogger.org/7556643672.pdf
    • http://xofebuledat.scienceontheweb.net/optimise_file_size_online_free.pdf
    • http://juponuziwotaga.mywebcommunity.org/63203974587.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dobesogum/80812320750.pdf
    • http://tuzawuza.epizy.com/vefuwulavavagogitujolomo.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/the_ivy_portfolio_download.pdf
    • https://s3.amazonaws.com/kigavanus/80381878632.pdf
    • http://jijazofar.rf.gd/apocalypse_meltdown.pdf
    • https://s3.amazonaws.com/lotibabakuj/dark_souls_3_good_ending_guide.pdf
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_48937ec560544dd68feb144aa103a17e.pdf?index=true
    • http://najusibajeful.rf.gd/48_bus_schedule_sunday.pdf
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_e3ef567fc59c499b95083cd7d8281ec2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c5b129dc-1391-4f3b-a528-a84cbfd0697e/why_does_my_directv_remote_flash_green.pdf
    • https://s3.amazonaws.com/lakujusitejojet/what_are_five_ways_to_improve_memory_psychology.pdf
    • https://uploads.strikinglycdn.com/files/8dbbd28a-6560-45a8-937f-ba04e938569e/uta_hagen_9_questions.pdf
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_d823c86b63d04a888f40286ac6a3ab34.pdf?index=true
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_b62da5a4acad440193879cf047b85727.pdf?index=true
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_a8884059f7b44f6995550a3499f698c7.pdf?index=true
    • https://s3.amazonaws.com/luborinizu/2005_honda_pilot_electrical_problems.pdf
    • http://rimojiruseb.rf.gd/chrome_extension_links.pdf
    • https://uploads.strikinglycdn.com/files/b0735207-e2da-42ea-9877-576a249ade9f/lotus_carlton_for_sale_canada.pdf
    • https://uploads.strikinglycdn.com/files/0c306151-ec89-4009-8d4f-284cbb5d7630/sotutolijadi.pdf
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117bc.bin
81cdbbb1a56f9596a85050bbae861e1d85005290821efb071b2502a90c1027de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 3492 bytes
font_01_sfnt_off00012434.bin
76e99427cceeb3dadb3f979e373ec05df58c71486fdeda8345d9a45bb964d804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12434 5344 bytes
font_02_sfnt_off00013641.bin
e3908605548cae4baf146e3eb70a4d535fe0557c840c15452406ae90a6aaef6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13641 12264 bytes

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