Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6311548aefd26e…

MALICIOUS

PDF

67.8 KB Created: 2021-04-08 03:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0c91c2df78a4ff20db2aae503572bce5 SHA-1: 25b716ded6ce52a16f049e57075ab4cf7e20cd5e SHA-256: bf6311548aefd26eefd7e996dc77d51b1de6ae82990bdc7f39cda47fdaf299f3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted hosting. The document body, though heavily obfuscated, contains references that appear to be lures for clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/123?utm_term=amma+bhavani+full+song PDF link annotation
    • http://zivemigidefis.mypressonline.com/xatomusileruj.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/ghgfYgh/crystalline_structure_of_metals.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/eNifVgi/word_trip_game_free_download.pdfIn PDF document text
    • http://ru-1.casa/free_smule_vip_apk_downloadlhn3m.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/h4OvPia/zombieland_2_cast_and_crew.pdfIn PDF document text
    • http://good-production16.site/coronavirus_briefing_sunday_10th_may2r0nj.pdfIn PDF document text
    • http://tiktokfrance.fun/definition_of_formal_assessment_in_educationyhchx.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/ahdicbr/19446571101.pdfIn PDF document text
    • http://rent-nout.site/oh_baby_songs_sensongs2k1k5.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/xevujinege.pdfIn PDF document text
    • http://bluebadgeapproval.com/diary_of_a_wimpy_kid_book_list_in_orderztyg9.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/hcvjhPC/92918569577.pdfIn PDF document text
    • http://azorocheat1.xyz/post_office_closed_day_after_thanksgivingc1ue8.pdfIn PDF document text
    • http://xasowokudat.medianewsonline.com/20382135096.pdfIn PDF document text
    • http://buyfastedcircle.xyz/walmart_hours_el_paso_for_elderlyz27zf.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/hgdjjji/advertising_and_marketing_degree_jobs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/takateg/nefejamen.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/73933045048.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/deril.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/windows_10_bootable_usb_format_type.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/14193585332.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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 5272 bytes
SHA-256: 8b60b461b2ec48c9266895a8d7dde88c991e24e9d2d7ac5dc2b5b0323209b1ba
font_01_sfnt_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 9856 bytes
SHA-256: e7deee40ddb0686ccffc80f5419345dc83658ef8376b8c03c7a89404e7a46ae3

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