Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b51cb553fd93c90…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 09:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7abeef3df7bf8b8cf2da5c908af67b14 SHA-1: cf6cecd35e160c9aa310c42213aaaf028e1638d9 SHA-256: 4b51cb553fd93c90885da7fd7d9f9d25f8923879916b1615b325daa6b1ee1d62
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

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://mezovuduw.ru/123?utm_term=aeol+cloud+app PDF link annotation
    • https://cdn.sqhk.co/mugetawelumi/9gehjBi/skip_bo_card_game_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/mFk4pHj/cleaning_service_business_cards_templates_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/hjghKhc/59150952528.pdfIn PDF document text
    • https://cdn.sqhk.co/dikozogub/chgViiM/commander_legends_release_date_canada.pdfIn PDF document text
    • http://zudezipebij.22web.org/standard_tri_fold_brochure_template_indesign.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/ggy8iil/fefilor.pdfIn PDF document text
    • http://good-production20.site/lumen_ohm_answers_college_algebra96ym4.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/sujh3G8/wogumefefovavudikov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_600bb7fae704f.pdfIn PDF document text
    • http://private-channel.site/clinical_chemistry_textbook9a2o6.pdfIn PDF document text
    • http://edapog.online/chemistry_book_11ux38y.pdfIn PDF document text
    • http://mpvideo.org/audio_pro_speakers_singaporetn211.pdfIn PDF document text
    • https://cdn.sqhk.co/wamamuli/EkoN6ii/pocket_penguins_size.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487192/normal_5fe381f799d7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5fee9dcdb9116.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/ar7hbhc/23618801930.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/b7Dm54T/tower_conquest_mod_apk_latest_version.pdfIn PDF document text
    • http://bluebadgeapproval.com/79788954103a4w64.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/QCwgfhj/bucket_list_ideas_before_you_die.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/gigfy8D/spinal_tap_needle_passes_through.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_5fd631aa57c78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damedosa.rf.gd/98175336840.pdfIn PDF document text
    • http://wupobivawenako.epizy.com/critical_point_of_a_function.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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 4780 bytes
SHA-256: f4867dc09574c88da45001c700f798ffe5ac404d909e2699825b759df10ac91d
font_01_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 12212 bytes
SHA-256: a81b30562f21e1c447028f74365ea0fc4e599f87559247604c89700eb689bc4f
font_02_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 16168 bytes
SHA-256: 0216150ac0e5ade23b072752459620ec704bdac01526bfbadd96d51f96873ef3