Malicious PDF — malware analysis report

Static analysis result for SHA-256 964a5fc737a3fbf6…

MALICIOUS

PDF

83.1 KB Created: 2021-04-04 08:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 90623fc8563c38a505087ca227d6d42e SHA-1: 72a20f13a041c2720697f5a1d856c4e85f4ec4df SHA-256: 964a5fc737a3fbf6f01dc3987269a77e2c68487a5a0d96e61a8cb987745b2573
66 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious links suggests an attempt to redirect users to sites hosting malware or engaging in phishing, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://gimoguvi.ru/strik?utm_term=summer+infant+baby+monitor+setup PDF link annotation
    • http://akb54.ru/vamoduvoxevepoba3ez8.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/bSgigib/nike_nba_swingman_jersey_lakers.pdfIn PDF document text
    • http://busforpay.online/mozaposhbb3x.pdfIn PDF document text
    • http://walkover.me/932333334047q2yh.pdfIn PDF document text
    • https://cdn.sqhk.co/bumegukomuza/7jfKXbq/boposox.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/clO7o4y/4155841826.pdfIn PDF document text
    • http://wurigakisedepov.iblogger.org/black_and_decker_cordless_weed_eater_spool.pdfIn PDF document text
    • http://fajutixosisi.22web.org/1963649985.pdfIn PDF document text
    • http://qlemelest.online/47443632469yr734.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/mjfRhcp/beaver_island_state_park_beach_hours.pdfIn PDF document text
    • http://generatorsale.ru/mijogecx8zs.pdfIn PDF document text
    • http://afracheat2.xyz/ranked_voting_system_maine52jvj.pdfIn PDF document text
    • http://moresukko.ru/cateye_velo_7_wireless_setupg9hn4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavavezalibizu.rf.gd/simple_adjectives_list.pdfIn PDF document text
    • http://bekisamusexasu.rf.gd/4748009679.pdfIn PDF document text
    • http://vuvumotelikev.rf.gd/mimasodijemijazutogolo.pdfIn PDF document text
    • http://legolipif.epizy.com/42349186667.pdfIn PDF document text
    • http://rewexukid.epizy.com/world_famous_buildings_and_their_architects.pdfIn PDF document text
    • http://dotenax.rf.gd/xobabi.pdfIn PDF document text
    • http://vepilezora.epizy.com/bebajotikorowuxu.pdfIn PDF document text
    • http://xunixamobogu.epizy.com/kahoot_sheet_music_alto_sax.pdfIn PDF document text
    • http://pefogitoveni.epizy.com/lugosusovafepus.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_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 5360 bytes
SHA-256: 6e90f931ce1e56db4d74e470282744a48698c7fe8364a1abcf5141b3eb201589
font_01_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 11336 bytes
SHA-256: 95ed2b1baccf5bced8e958c61c11ef64ce3c1a022ca9c19a57429e4415bb8ec0

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