Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46dedad436b4fa9…

MALICIOUS

PDF

81.8 KB Created: 2021-03-16 10:29:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50626e6429fea0edf0a3ce1bb4deedd1 SHA-1: 716214462c1758a9e0a6eeb78c4c4e2842d9d491 SHA-256: a46dedad436b4fa9387a3ce3dce7de564f59d2e5269578aefcb96290346882be
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting it's designed to drive traffic to various websites. The embedded document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but does not provide clear instructions. The primary attack pattern appears to be the distribution of numerous external links, likely for SEO manipulation or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=what+does+the+woodcock+johnson+test+measure
    • http://olipaka.xyz/mikrotik_sxt_lite5_default_ipittvr.pdf
    • https://cdn.sqhk.co/wunokebewoz/VQhbGic/50951389850.pdf
    • http://wowitaly.pro/foxudup4l6y.pdf
    • http://goodsun.space/cargador_duracell_is1000ig405.pdf
    • https://cdn.sqhk.co/mebosuxular/UhajjPq/generalized_impulse_response_function_matlab_code.pdf
    • http://mx50off.pro/72080091431yjsnn.pdf
    • https://cdn.sqhk.co/noneniwetav/bfVijji/putujenasafubidonago.pdf
    • http://devlp.club/how_do_i_draw_a_rose_step_by_step_for_beginners5r962.pdf
    • http://supportcopyright.net/how_to_invest_in_stock_beginners6wmxr.pdf
    • http://nasifulufajav.22web.org/lincoln_logs_building_directions.pdf
    • https://cdn.sqhk.co/zavilisuga/jfvhiaR/music_theory_definition_dictionary.pdf
    • https://cdn.sqhk.co/naxupowu/ifuhyov/fist_of_fury_film_location.pdf
    • https://cdn.sqhk.co/xevowuto/jbiiugL/kojevilamimetifodisizozam.pdf
    • http://microdigitalmeter.xyz/que_tipos_de_comunicacion_oral_existensj98v.pdf
    • http://findattime.com/laxosatumarokitabldf3g.pdf
    • http://jojiluvapesoj.22web.org/delhi_metro_map_full_hd.pdf
    • https://cdn.sqhk.co/woselukafo/euf2ljg/stickman_sponge_rope_hero_gangstar_crime_mod_apk.pdf
    • http://naturwows.space/baldi_s_basics_free_playz94ui.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pivutabomenatam.rf.gd/john_deere_tractor_parts_near_me.pdf
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_c4ad17ea5a044489a62392df9dac6133.pdf?index=true
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_8154002a38774bfdb98439cb60a36b45.pdf?index=true
    • http://wiresudakijiwa.rf.gd/fiwojofavukok.pdf
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_5735343aec454e8298e1f86b54283996.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_off00010021.bin
8891b336a6fc4c5dcc36d784cd92a666edf8394db38b9cc16cbc47a0aaa66156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 5392 bytes
font_01_sfnt_off00011267.bin
c7c48f56ead1a6277137edb8662d392d46d3cf6fc9e7b2054f7d6c4cd4181533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 11512 bytes

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