Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c940cf2a9c11eb…

MALICIOUS

PDF

84.4 KB Created: 2021-04-05 08:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8433e5bffe83baa0e1313afda9d44fca SHA-1: de796fc8636ec817ec63c175a55be45e96f96d5e SHA-256: 98c940cf2a9c11eb0a158bad86a7db1314d1a090a660204ede33a973ba5b8c1d
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host a phishing page or distribute further malware. The presence of multiple embedded URLs, some of which are unknown or lead to potentially malicious sites, further supports a phishing or malware delivery intent. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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/aws?utm_term=life+without+school+paragraph+in+english
    • http://wiwulunomekig.iblogger.org/86857199913.pdf
    • https://cdn.sqhk.co/nezosomoji/fD6gcjg/33412109738.pdf
    • https://cdn.sqhk.co/givesaxi/iwA4id0/gravity_falls_characters.pdf
    • https://cdn.sqhk.co/pibavasedegi/2jg6vMB/jurassic_minecraft_server_download.pdf
    • https://cdn.sqhk.co/noxivudeva/hjdGjgQ/carolina_reaper_chilli_pepper_seeds.pdf
    • https://cdn.sqhk.co/mugapowejog/gfifgig/ants_in_house_texas.pdf
    • https://cdn.sqhk.co/fuludasowipu/Hlqhchc/english_premier_league_store_london.pdf
    • https://cdn.sqhk.co/gefeloxo/ehgCigZ/canavalia_ensiformis_seeds.pdf
    • https://cdn.sqhk.co/giwitosak/NxhcQii/41184250484.pdf
    • https://cdn.sqhk.co/pabelewexo/niephfk/crazy_zombie_9._0_unlocked_snokido.pdf
    • https://cdn.sqhk.co/felinavaw/Bhjgd5g/science_laboratory_safety_guidelines.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuvovoxigumuz/what_does_the_weather_channel_symbols_mean.pdf
    • https://uploads.strikinglycdn.com/files/67a37924-4df8-4a7d-9124-f0fe637d35c3/69404207292.pdf
    • https://s3.amazonaws.com/tiniruru/movie_script_writing_free_download.pdf
    • http://bopebewi.epizy.com/associations_incorporation_act_1981_form_8.pdf
    • http://sapakebozo.rf.gd/schwab_beneficiary_designation_form_ira.pdf
    • https://s3.amazonaws.com/bulikowexunepov/73098260183.pdf
    • https://s3.amazonaws.com/jizubisetebof/skyrim_the_fallen_arngeir_bug.pdf
    • http://tuganireriwem.rf.gd/41733187397.pdf
    • https://uploads.strikinglycdn.com/files/7899f49b-3076-4ee5-976b-9c8e8cea1535/xufonowusolibolafaleludu.pdf
    • https://s3.amazonaws.com/dejazuvorira/44233100795.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7da.bin
c660ddbef5ffce8ec1922a90984f56f32ce61434b0033be3f4258de8f907fafb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 5312 bytes
font_01_sfnt_off00010a06.bin
5ed8e3426007382aec837d45be7c28e6189579167be7c958b7cdfeeabfd3dc7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 10784 bytes
font_02_sfnt_off00012e85.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 16204 bytes

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