Malicious PDF — malware analysis report

Static analysis result for SHA-256 066655204dcb49ea…

MALICIOUS

PDF

77.2 KB Created: 2021-03-29 10:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09d1cb7b3243804e6fb2eeb8ae5116ad SHA-1: d3393f4ce4edd02a106ae32121fc7eee581d9364 SHA-256: 066655204dcb49ea06eb1114843136e5bb063eeb24a8f457e4f82905d447755b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/award?keyword=pharmacy+alligation+worksheet+pdf
    • https://cdn.sqhk.co/zimuteraf/gdigP9L/atomos_ninja_v_dummy_battery.pdf
    • https://cdn.sqhk.co/bixatavafut/O3yWggO/ironite_home_depot_canada.pdf
    • https://godobinoka.weebly.com/uploads/1/3/0/8/130815080/70efb85ddae1521.pdf
    • https://kavovukabej.weebly.com/uploads/1/3/4/6/134621515/1526785.pdf
    • http://freshmind.net/pet_rock_inventortms9r.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • https://cdn.sqhk.co/wowedofu/ejjgdhA/32591115147.pdf
    • https://sowumubisi.weebly.com/uploads/1/3/2/8/132815199/vawobavo-roxod-xubopowuzegam-vetijazin.pdf
    • http://kozlo.space/65329633928uxe1m.pdf
    • https://cdn.sqhk.co/dulidara/hhdbjdv/85464973008.pdf
    • http://mavito.online/tanki_online_crystal_generator_no_sua234u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_60d3c6f6472449fda02b248684678df4.pdf?index=true
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_e9821e9b388d42f894c8fc812d80be63.pdf?index=true
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_5ffd3832b89c4148b10b18caad90add6.pdf?index=true
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_dd73bdd4e2f34b94b65294bef0611b64.pdf?index=true
    • https://s3.amazonaws.com/lowuwofuxali/arraylist_and_linkedlist_performance_in_java.pdf
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_1b9adb5457184bb6ab58ea93f5159528.pdf?index=true
    • https://s3.amazonaws.com/rovuweraja/bnf_2016.pdf
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_615e05edc5de4e1e9651455774060a3a.pdf?index=true
    • https://s3.amazonaws.com/fadedosi/camptown_races_recorder_sheet_music.pdf
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_8745fb7841384c9c838c8ea9b23d0213.pdf?index=true
    • 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_off0000ee12.bin
030ef565b2b733519a201f497a17f7245b24bdb5dddc92243228152ee28be2f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 5828 bytes
font_01_sfnt_off000101da.bin
6b05aee4dc67797fdde1decd16f18c2133f999ae91d4bc1b062106b87f440355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 11000 bytes

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