Malicious PDF — malware analysis report

Static analysis result for SHA-256 79df24eb9a2e3c24…

MALICIOUS

PDF

79.4 KB Created: 2021-03-14 04:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e60d610c87c65ca3f34e1ae2a810f85b SHA-1: 8ac0409399634e5b5e034ce6a6dc6c97f4a29599 SHA-256: 79df24eb9a2e3c24ac5223c878853be7246d072dab840515bc2f9891ba88b502
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9997

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://seumenha.ru/123?utm_term=aiaa+full+form PDF link annotation
    • https://cdn.sqhk.co/sileluzorupo/fmgcpgg/45543940381.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/fvjbWT8/56025144204.pdfIn PDF document text
    • https://cdn.sqhk.co/fedugaxoloz/0IDnhdb/85902682252.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/0qja7Sb/3471024046.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/gsibSYd/sajesebur.pdfIn PDF document text
    • http://botarim.22web.org/health_and_safety_courses_for_employees.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/29816143239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://susegutej.epizy.com/vewasuxakipikimutu.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/proshow_producer_9_free_templates.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_11f454eabe2f44fa8e046d77f551bb5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remeranexe/85840235825.pdfIn PDF document text
    • http://lidazadopedu.rf.gd/ideological_conflict.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_2fdca1f8747f48fe8cd4c70d65720f20.pdf?index=trueIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/carnage_meaning_in_tamil.pdfIn PDF document text
    • http://gufaxepelirub.rf.gd/capitalization_and_punctuation_test_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/urdu_calligraphy_font_free.pdfIn PDF document text
    • http://bolusober.epizy.com/84634863360.pdfIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_bf5deb202ff146a8a573d9e1c1b46b08.pdf?index=trueIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_17a680a82a504a54b7ba33ffefce91cc.pdf?index=trueIn PDF document text
    • http://labimovoguduwej.epizy.com/how_to_fix_roomba_charging_error_1.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 4300 bytes
SHA-256: 280f89f38a2c4780df9c027f8fc46b978aa1c5721cd254c6483476f59501c1ae
font_01_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 11704 bytes
SHA-256: 32d3da952b45cd489a91e0a38dd48afcd561642b3f4fc6e7b49854960a606e63
font_02_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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