Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc6917ac8363b78…

MALICIOUS

PDF

73.6 KB Created: 2021-03-31 17:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5ed0a4613a8f7fb652163df2044aa3d SHA-1: e6b11d7371ea75046751e08dd05a128ba340758c SHA-256: dfc6917ac8363b783e97b13516a92f22b544c9f3cc2a640b124e4cd049fe02b3
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to academic materials, likely a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=bsc+computer+science+textbook+pdf
    • https://cdn.sqhk.co/xumesapaxoku/jagcGij/idle_oil_tycoon_wiki.pdf
    • https://cdn.sqhk.co/zofizitene/hJjfohf/cheat_game_war_of_empire_conquest.pdf
    • https://cdn.sqhk.co/gusoguribus/chhjjgg/19466618488.pdf
    • https://cdn-cms.f-static.net/uploads/4417992/normal_5fd25962829b7.pdf
    • https://cdn-cms.f-static.net/uploads/4403565/normal_605820d1dcaf7.pdf
    • https://cdn.sqhk.co/jesupasuzoku/hjYgfjj/occupational_health_definition_ilo.pdf
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/jefudubadarolox_fupamigoz_ligix_jalum.pdf
    • https://cdn.sqhk.co/lozuzupadis/8jcBn9A/lineage_2_revolution_best_solo_class_2019.pdf
    • https://pawizujepus.weebly.com/uploads/1/3/1/6/131637171/2458276.pdf
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/zozujidudazi_nafuwolatasadi_winadakiziponap.pdf
    • https://cdn.sqhk.co/ledadegivid/BihzJie/caa_pakistan_online_application_form.pdf
    • https://cdn-cms.f-static.net/uploads/4468253/normal_60522894baf98.pdf
    • https://cdn.sqhk.co/woleparos/JmDqibr/pearl_jewellery_manufacturers_in_hyderabad.pdf
    • https://cdn.sqhk.co/wisewuguv/9iahfgi/97736668151.pdf
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/vozufupesupo_nofobizer_kavijotu.pdf
    • https://cdn-cms.f-static.net/uploads/4381287/normal_60511045c065f.pdf
    • https://cdn-cms.f-static.net/uploads/4374848/normal_6019273a3b046.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mawesenasijoser/manual_aerators_for_lawns_home_depot.pdf
    • https://s3.amazonaws.com/lejivugeleguwod/gusidejazexave.pdf
    • https://s3.amazonaws.com/mipizaju/44899562874.pdf
    • https://s3.amazonaws.com/lowebemuwojiso/nccn_guidelines_management_of_immunotherapy-_related_toxicities.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ea.bin
467d0e817b7054a76f153309a346b70c2a796d3e2722775b21e53bbd22eff209		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 5380 bytes
font_01_sfnt_off0000f424.bin
3c838c2e73d202bade37e3622d6edcb78c71ffe89f3f083fc8196e45329006d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 10860 bytes

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