Malicious PDF — malware analysis report

Static analysis result for SHA-256 e954d6dabb24b31c…

MALICIOUS

PDF

73.4 KB Created: 2021-05-15 02:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dfbd899f6741d98cc49acce589b7b993 SHA-1: 3a8bbe3164ef86b1c462c31ed7ac5b6d5efc5797 SHA-256: e954d6dabb24b31c9dfc8d92913b51dbf90acb8360773b1b109aedf138821c1f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDFs, indicating a link farm for SEO manipulation. One of the primary links, 'https://zajinet.ru/strik?utm_term=american+history+book+pdf+download', is presented as a lure for a book download. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://zajinet.ru/strik?utm_term=american+history+book+pdf+download PDF link annotation
    • https://cdn.sqhk.co/febapaji/iagjhX4/konatozujemogu.pdfIn PDF document text
    • https://ninisezidopif.weebly.com/uploads/1/3/5/3/135391617/38239efa5.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/vuxep.pdfIn PDF document text
    • https://zujizivuzilinum.weebly.com/uploads/1/3/5/3/135344014/baxojo-vadoja-gekale-sosikaze.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/CsieCfT/75131708938.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/gisWibI/anthills_mtb_houston.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/Cghhaja/21465206299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_6066c36654980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_606adb733855c.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/sajatesawodiji/sazid.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/number_of_shares_outstanding_on_balance_sheet.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_34594aa23b9b47c7bba9e0ec53566587.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/what_navy_ribbons_do_i_qualify_for.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_b1d7282d49cc464988341c59f1e26ba3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widofafane/gabion_retaining_wall_design_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/86950075216.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/best_typing_games_for_pc_free_download_windows_10.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_7f9df09badff443aa101d3e6a6e5a3c6.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_828fbf80630646ebac21e2a95f8aa5c8.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_b3629b2a86764cafaf8bdc42189baf80.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavabi/pawinaxiduruzuraja.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_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 5784 bytes
SHA-256: 56975335b970e349259466d3f2573e5eea1848229975414b05fff260d56713ac
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 10664 bytes
SHA-256: 7d13acdbe733f7f684be663dab11356e89bb31c84a54895741b87aad9c4e0cb4

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