Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c83ca79132ffef9…

MALICIOUS

PDF

78.2 KB Created: 2021-03-21 21:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ed369b5e711f719a4da7395c2e031e14 SHA-1: 9f79a5b4f1576f08de510a9396df8f9ce1f20ccc SHA-256: 6c83ca79132ffef90a08b5987dfaaf758f5fee88b65ccec92c4b84afdc080d0c
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 0.9991

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://zajinet.ru/123?utm_term=oregon+winter+steelhead+fishing+guides PDF link annotation
    • https://cdn.sqhk.co/ragonujip/ieghajb/81713556761.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/g2ijFSq/how_to_make_origami_flowers_with_a4_paper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duposavolat.rf.gd/20811665142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d98591f-4bc7-4000-8d5e-cf55ed44752d/what_to_do_cannery_row_monterey.pdfIn PDF document text
    • http://zapurokorilagar.rf.gd/ace_test_series_civil.pdfIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_564b832590ec471ba71ec80ab240dc9d.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_38650be4ca7b4efd81f41d9a81aeb2bf.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_3442bd380b764c819f4375ac493385cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nokiva/mdm_sms_report_assam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bffeb6cc-ae2c-4f6b-b8d9-10e3e83fcfa4/map_of_the_world_blank.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/vigofikefiwodexafid.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/zavibaxabuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a1b15c-e8a8-4eb7-8552-16e3a431405a/fender_vibro_champ_xd_schematic.pdfIn PDF document text
    • http://retejades.rf.gd/bhojpuri_video_2018mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/mosunanejidumere.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/free_letterhead_templates_with_logo.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_22691694920f4c4f9c51c2d1aad3a569.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c969aec3-0b8d-4f5b-bedf-de1d8dabdd4d/what_are_risk_assessment_tools_designed_to_do_select_the_best_response.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f6ec98-2051-4b93-9d01-0dea0745dc20/my_favorite_things_sound_of_music_ukulele_chords.pdfIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_c6164ea56dcd4e3bbe116adf7c1e3157.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4257cbc5-0e71-4b38-bef1-3ceb2e67bc76/vubujisimomatefami.pdfIn PDF document text
    • http://dejenirapavo.rf.gd/how_to_make_a_bolt_action_pen_gun_rust.pdfIn PDF document text
    • http://warunegiluj.rf.gd/how_to_cook_gammon_in_slow_cooker_slimming_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411eeaa0-5641-4a40-b73f-3799c2c909a5/nature_man_and_woman_free_download.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_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 5288 bytes
SHA-256: 7feac0611088d0ea462824974d7422e3ad0fd654d7df1af69abbae67354b1a28
font_01_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 10796 bytes
SHA-256: cc326417d6b293598c22793903e41157a653d70acd1a123f0d412bef52ffb23e