Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f67ef8a2ea14ba0…

MALICIOUS

PDF

110.2 KB Created: 2021-03-26 07:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 841db10e05cb2b47a198ba65e25702c2 SHA-1: f3e8e2f9e3c11251701de9e9b90989d3c31c9ad3 SHA-256: 4f67ef8a2ea14ba0fe12c26304166e079a008c9040687eacdf135beef1947914
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to search terms, reinforcing the lure.

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://zajinet.ru/award?keyword=banana+fish+manga+completo+pdf
    • http://dobilarujokux.sportsontheweb.net/bitsat_2020_syllabus.pdf
    • http://xojitufos.66ghz.com/zozubetolebulid.pdf
    • http://zevuzigix.iblogger.org/nudatuzumo.pdf
    • http://tuduvodakep.mypressonline.com/vitegakogenabives.pdf
    • http://reguvixelupuj.iblogger.org/1635075912.pdf
    • http://nobukuxokosiga.mypressonline.com/14172175175.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/07a6df13-c18d-4984-9aa7-dca9ad724490/jobizo.pdf
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_b6f3f7c21f404b479ac2bdb1767b1c06.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6812e0b5-00f1-42fa-b5f3-a394dc1a1382/bonaire_evaporative_cooler_replacement_parts.pdf
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_b66a2192b7184d5bba1274fa3646e15a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/396a73fd-c7f9-43a5-90e0-93f2ea8d2c78/54503953329.pdf
    • https://uploads.strikinglycdn.com/files/43de2e6f-1c0b-4bc0-b5b3-1bd058f6bed9/metazagutesa.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/lord_shiva_ringtones_in_telugu_free.pdf
    • https://uploads.strikinglycdn.com/files/efd688c4-1bb9-4cf2-9f34-a68f77316837/what_does_fp_stand_for.pdf
    • https://s3.amazonaws.com/metubevozisul/brooklyn_nine_nine_season_2_free.pdf
    • http://wosolebaxuwutux.rf.gd/crimson_skies_pc_game_free.pdf
    • http://wororezijetixa.atwebpages.com/52454744718.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_55e4cb59900e48689e993cd599318029.pdf?index=true
    • https://uploads.strikinglycdn.com/files/beda51d2-42ce-4ba7-aa47-9db4ca3fec12/top_logo_design_apps_for_ipad.pdf
    • https://uploads.strikinglycdn.com/files/47a2edcf-fb1e-4fc7-85d7-646ecf34536a/what_is_the_best_waterpik_toothbrush_combo.pdf
    • https://uploads.strikinglycdn.com/files/10f49ec1-6102-4c4c-8738-faf0d893875b/50_shades_of_grey_music_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001388c.bin
c75145f97cdb46073e891ba34ce116f99b7d5527205a2d312f5f6f5b20792bba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1388C 17000 bytes
font_01_sfnt_off00016e74.bin
779478f4d695cfa8698cc571add364c7222c95c86911aa371cb869044691442d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E74 5524 bytes
font_02_sfnt_off00018125.bin
199b9dcb7855d1b2f3b93fe7c9b9925e6ea9bfd781a5b918ef3d7295e3a408ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18125 14324 bytes

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