Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e9ed0e200dcc95…

MALICIOUS

PDF

88.9 KB Created: 2021-04-22 01:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: acc3007752f9c6ae35bec7dcf2501584 SHA-1: 11a885ae76f556cf30215ebcc51f1c0f0a8cb319 SHA-256: 42e9ed0e200dcc9544400b9e883af2a13df455878ff57aef5d8e36812b94b8c9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://soxebez.ru/strik?utm_term=universal+audio+apollo+twin+x+duo+heritage+edition+10x6+thunderbolt+audio+interface+with+uad+dsp PDF link annotation
    • http://hamlikjorettoop.ru/the_brown_v_board_of_education_case_1954_reverse_the_courts_ruling_in_the_caseqbkwd.pdfIn PDF document text
    • http://kalavar.xyz/siemens_qp_breakergyxl6.pdfIn PDF document text
    • http://pristav.pro/why_do_we_read_sundara_kandamt24wv.pdfIn PDF document text
    • http://italystore.pro/2800840858kxaxi.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.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/a3af2272-61f8-4ed2-930d-edd03066c496/fevuzusififarivoju.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_7f1330bf78254701abf5baca75b79465.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/635289b5-4780-4956-96d5-13e366369ae2/36857592070.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/49476487075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9b6600-4cd4-4d48-88b0-43e4b7738878/83548213927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22cad7d5-6d69-4d16-819b-254cad7d014e/how_do_you_run_a_3_phase_motor_on_single_phase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6979060-a360-4095-9c1f-ea77c4e7683d/nelekapulex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0181dbd-ee50-4335-b119-68e00cd015d3/10218772444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bd0f00-5db8-4d30-ad6e-c2921b182ecd/fight_club_book_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/the_road_not_taken_movie_ending.pdfIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_929329c1eb1743feb9506b1e98af792f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8a24a3-56e8-4725-9024-ddde73c20b5d/96756934927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc23592b-be6d-4ad8-a074-72d516a2b933/myles_munroe_teachings_on_fasting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bbc28c9-d9a8-4240-a8be-603ea2c30ba0/http_error_response_code_417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0286c86e-dfd1-4f03-ad7f-629e2f16dc56/scala_rider_g4_spare_parts.pdfIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_6d804a55cbbd44839ab967153440b5b8.pdf?index=trueIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_34bf4f4657b54ada84944f0306dc2b0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd27f52-b8f6-44ea-9457-009887b078aa/wasezegajadimijezuj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 6116 bytes
SHA-256: ceea08a10e92b12aaf54679f135ee9d437688f345fbc176dd50366b20e067538
font_01_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 12192 bytes
SHA-256: 867172bf4bb2c4faf19f01f989ebe38081283cf533dfbc77ef7b4afb1b8b6ae1
font_02_sfnt_off00013f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F74 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953