Malicious PDF — malware analysis report

Static analysis result for SHA-256 225a19bb81f83dfb…

MALICIOUS

PDF

77.1 KB Created: 2021-03-19 23:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc35abafac41231b4969caa3f7969e85 SHA-1: 31eb93a93f530de4a09384cd68eafd6dafa952a8 SHA-256: 225a19bb81f83dfbf8ed142a8e5dba557faf50b129bd209393aec2d36f2e98de
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to 'resalured.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/wix?keyword=trust+jb+driving+school
    • http://zarabotok.space/fire_emblem_heroes_mod_apk_3._5._1042g3.pdf
    • https://cdn.sqhk.co/guwuweri/1xbdPij/iron_chests_mod_para_minecraft_1._16._1.pdf
    • http://damvglaz2.xyz/moto_g_2nd_generationt9y1e.pdf
    • http://fenellalucynelle.info/how_much_is_rob_wolfe_worthlbv6j.pdf
    • http://doorstepcomputers.com/755654391977xtta.pdf
    • https://cdn.sqhk.co/waxoxewanuvi/xje9PLR/cod_modern_warfare_servers_lag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kuxegu/xediduzuradez.pdf
    • https://s3.amazonaws.com/sejakopa/xutibawubotaniwopokitos.pdf
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_5481b4d09222434ba1d5ce050c4027d0.pdf?index=true
    • https://1437f3f1-f978-4e1b-9120-555090070881.filesusr.com/ugd/d4ef56_c09b23a9f6de498ba19ce10870947970.pdf?index=true
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_773e6cbbbc6e450bb47602cb457000bd.pdf?index=true
    • https://s3.amazonaws.com/kewakuko/teri_aakhya_ka_kajal_song_320kbps.pdf
    • https://uploads.strikinglycdn.com/files/75b5e349-13a8-4546-b64f-94812637deaa/25027721559.pdf
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_ab37a25c9d90486fa8629f509a55ba47.pdf?index=true
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_f090d6daf7054c2b91a14447cf981979.pdf?index=true
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_0a76302cc7f645e786917db5251d159f.pdf?index=true
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_9936512f8ef94c05a0ac642f630058fa.pdf?index=true
    • https://s3.amazonaws.com/jitimesolagun/boolean_algebra_mathematics.pdf
    • https://uploads.strikinglycdn.com/files/7f970d3d-7a24-4380-9033-09141c03d310/sagesepulimopoweguxazusi.pdf
    • https://uploads.strikinglycdn.com/files/c6517fb8-2055-4c08-ad9d-779bf272cbae/how_to_dry_only_with_lg_washer_dryer.pdf
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_64428aef36014064ada8d28070f889e9.pdf?index=true
    • https://s3.amazonaws.com/kijelopazekune/360_performance_evaluation_definition.pdf
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_27b005b2c2b94a958eb4bab70e489eb0.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_off0000f10c.bin
6d12ebdcafeec8e8f82c2b0d78db3c6f4845f202d036edb5f1267b60466c2e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 5216 bytes
font_01_sfnt_off000102d0.bin
b8ce0bccd921da536b3edbc67c120e5ed2efec3776170cc1cd4f12bc8b49f08a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 10612 bytes

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