Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c09be1493cb3c36…

MALICIOUS

PDF

70.7 KB Created: 2021-04-05 19:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1ee8ad341b1ecda9c1fff4450bb3d92a SHA-1: c3fd8c3bd42641546264e55ab11b792bb6030f59 SHA-256: 1c09be1493cb3c36ce8492b2399b463aa7784bcbf7ca0ade2dc590c093dc523b
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate an attempt to redirect users to potentially malicious content, possibly leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://jacksth.ru/wix?keyword=st+joseph+fullerton+school PDF link annotation
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/vakisebiwudalidugu.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/dTL29Sw/fafoboxidafekakitijov.pdfIn PDF document text
    • https://fokubazukif.weebly.com/uploads/1/3/2/6/132683137/bomenex-zexadefitar-siwesu.pdfIn PDF document text
    • https://cdn.sqhk.co/fapiwejagiz/ImjbCSq/disney_crossy_road_in_app_purchases.pdfIn PDF document text
    • https://nakaporona.weebly.com/uploads/1/3/1/4/131438848/7377458.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/adW0SVa/ziloxibo.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/fEjjiip/logo_quiz_2020_level_33_answers.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://pshcomonhere.xyz/how_do_i_fix_my_samsung_washer_error_ubasuvk.pdfIn PDF document text
    • http://agent-ritual495.online/how_to_clean_wolf_toaster_oven75wg1.pdfIn PDF document text
    • http://mnogolidov.xyz/sufowejonr949.pdfIn PDF document text
    • http://thehensleys.org/how_did_brown_v._board_of_education_change_the_legal_definition_of_equalitygaaik.pdfIn PDF document text
    • https://tutitobogin.weebly.com/uploads/1/3/4/4/134485970/tozan-wopalanekesopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/492bf258-e09e-42c0-af9d-ba03f4c70f80/zuderilulatixisoxapar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77cec34-8c09-498b-991f-fbf20dd6c28d/bajaxerewijibovoleled.pdfIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_620a1705bb094a54bcc54a892a569622.pdf?index=trueIn PDF document text
    • https://0633afab-057d-4448-85e1-ac1a97571725.filesusr.com/ugd/66920c_4c23a5d2cdd6419486f03e6a3f533f86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1b1078-51f1-4ce0-b61e-60b817e32b5c/inheritance_christopher_paolini_book_5.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_c1319e3efec046fdb9861145c12fb6a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ceadc2-0356-43ba-a0bf-8a415564877d/61889890057.pdfIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_8b229817f7b044efa587d2291d0cf5fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd2d43f-0752-4839-af6f-086b660743bb/11_22_63_tv_show_season_2.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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 5072 bytes
SHA-256: 0fa189cfd435a7bc684f744a4878c23aab5525179464092e2595cf71ea46a8a5
font_01_sfnt_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 10560 bytes
SHA-256: d9fa1e6211e6db9158c8ec6480df3c0a734a181a99dd2e2f7c801b55085bdb37