Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfb96665ca9d59a…

MALICIOUS

PDF

78.4 KB Created: 2021-03-16 21:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42ed42cf229a5572b9b2fb536e1c63f6 SHA-1: 7f3ff3ffcc236b02b70417bceab2440dd98503ec SHA-256: 1dfb96665ca9d59a33581c96cb23044fa555f851cdc6dd331f4c0d01465c9c2d
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing/malware content. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs suggest the document's primary purpose is to redirect users to external sites, potentially for credential harvesting or malware delivery.

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.
  • 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://seumenha.ru/wix?keyword=chapter+11+modeling+meiosis+lab+answers
    • http://basvuruizleme.online/what_are_the_5_types_of_readingl55h1.pdf
    • http://afracheat8.xyz/93553467282bave4.pdf
    • http://islta.fun/5196180271svh92.pdf
    • http://koolmaxt.online/posalomolev2j4j.pdf
    • http://1ux.site/dewalt_3400_psi_pressure_washer_soap_dispenserwcsxq.pdf
    • http://reduslimitaly-ufficiale.site/spot_grammar_mistakes_worksheetab9k2.pdf
    • http://ag-management.space/rivewidatotirasiwcufx.pdf
    • http://goldenframecollision.com/fabudovilabixedadaxapujimsz8xm.pdf
    • http://usacreditscore.info/vezodobenuzepuzowomofimazutu4l.pdf
    • http://ketotreno.buzz/fadeguxabevutumopipfabq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/retobifulipo/pretty_little_liars_season_7_episode_17.pdf
    • https://uploads.strikinglycdn.com/files/ee1ebe1c-69e2-45ef-a08d-b15dccd7bae9/how_many_ounces_in_a_sonic_route_44_cup.pdf
    • https://uploads.strikinglycdn.com/files/271d490c-5fd7-4942-a677-2f713585b33b/zojorubuzifitilogixamidu.pdf
    • https://uploads.strikinglycdn.com/files/30cc7de5-c4bc-4565-85a6-93a3d0e40c56/why_is_my_volume_all_the_way_up_but_still_quiet.pdf
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_e7be593393c44864af79e4cf274a7b49.pdf?index=true
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_ab99bc46286e4a518ea9d0d9ddea8b56.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a408da4-b5ef-4484-96c8-f2f457dd2e12/hoover_carpet_cleaner_parts_fh50150.pdf
    • https://uploads.strikinglycdn.com/files/90d5fa66-deb7-4d83-952f-26628b323712/best_books_to_learn_android_development.pdf
    • https://uploads.strikinglycdn.com/files/b0eded97-b614-4005-bc4f-9b615d10cfc3/dowivazusubazevemase.pdf
    • https://s3.amazonaws.com/biwubeleba/92756384132.pdf
    • https://uploads.strikinglycdn.com/files/73bb2045-139d-46ea-8ab1-b39ac9320498/favidesabovatoto.pdf
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_0eed59a9bfb844448fe85179bde1d986.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e762.bin
7a19d6ef100e5b9c29c09de1624e4f6bc13252d3b2a9487c3454ee5256a711d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 3024 bytes
font_01_sfnt_off0000f235.bin
f74d349c711c11ade5fd9f35a66d3da61c430bff9b837d517d8c634c188f434b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 5560 bytes
font_02_sfnt_off000104fc.bin
a43720e90e6803106fb2cbd9ef68aff2625bd0ce97c49c888db50379f2cee5d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 11964 bytes

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