Malicious PDF — malware analysis report

Static analysis result for SHA-256 637bed617c1477d3…

MALICIOUS

PDF

74.8 KB Created: 2021-03-28 13:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e9fcead183862400070b4f41dbf57a56 SHA-1: 0b4f40950e0d8a96688e5324afbfffb8defa178c SHA-256: 637bed617c1477d35812a416c3a434b7321bae70b71a7e64d042c26ffd7cece1
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan. It utilizes a link farm on disposable hosting, with URLs like 'fokemale.ru' and 'crubr.space', suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a misleading title, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://fokemale.ru/123?utm_term=primary+school+admission+form+sample+pdf PDF link annotation
    • http://crubr.space/what_is_psychoanalytic_theory_all_aboutefwuo.pdfIn PDF document text
    • http://ximoteduzax.22web.org/derek_prince_books_secrets_of_a_prayer_warrior.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/if26rgd/bucket_list_things_to_do_in_the_us.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/a6551SU/brick_breaker_game_for_pc_free_download.pdfIn PDF document text
    • http://arfesopt.com/sri_lanka_post_international_mail_trackingepwps.pdfIn PDF document text
    • http://casbah2point0.com/wupabunideladidistnh1j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480745/normal_602a039f968b1.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/p8ifGgc/online_piano_midi_creator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_603c32912ffb9.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/caWAigl/card_matching_game_javascript.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470017/normal_5fce638000b72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478414/normal_6007f11e7686d.pdfIn PDF document text
    • https://cdn.sqhk.co/tijovomiv/dGjigjh/red_ball_gown_dresses_cheap.pdfIn PDF document text
    • http://kzrovk.xyz/vilatizalict0i1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_5fd2816e1a495.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_29b39475a9b946f287a288d41351563e.pdf?index=trueIn PDF document text
    • http://sozolagefovar.epizy.com/1931130572.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_ca8ae97ad69940888cf7f834b8f75d78.pdf?index=trueIn PDF document text
    • http://zojiwedut.rf.gd/ronuwudaseke.pdfIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_83f5abc4a1b9427583b899ecc4da1f16.pdf?index=trueIn PDF document text
    • http://pujasozitibuzi.epizy.com/pixovagidapekanejoves.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_3afda3fa17454d78855d6c3927ded640.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_06b4c392985a4070baea84ef2da87605.pdf?index=trueIn 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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 5496 bytes
SHA-256: 6e9a16ee0962f3e2933b86add127849ee07cc49fe2c62eb8cf105c407d8c289a
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 10292 bytes
SHA-256: ae91904cbffbe560bac58f8cb2bca45a1df37b4de4e5d08fb43011307a40e44f

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