Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ba32a20dea2883…

MALICIOUS

PDF

75.2 KB Created: 2021-05-14 02:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eae25b1ea2538eeafb759161b1ff00a5 SHA-1: 7c854078ca99e50bfa60e7496580c1b1f83a87d1 SHA-256: 70ba32a20dea28836de929dc4e92786c876eb2d6fae20f1cc16c3a56539e6f17
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

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://jacksth.ru/strik?utm_term=fagor+america+pressure+cooker+replacement+parts
    • http://kogemotuju.getenjoyment.net/setavigapawup.pdf
    • http://ccckkkkk.space/divinity_original_sin_2_best_talents32yvv.pdf
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/sidima.pdf
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/dfcd7c24.pdf
    • http://ru-en.xyz/mahaan_songs_mymp3song4fpcs.pdf
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/af8c4e2c340dc2f.pdf
    • http://remoliwagofaju.mywebcommunity.org/39454766736.pdf
    • http://laserisesiseno.getenjoyment.net/corporations_act_qld.pdf
    • https://kotekadugufed.weebly.com/uploads/1/3/6/0/136086248/1237710.pdf
    • https://mepuralomelefaz.weebly.com/uploads/1/3/4/4/134494325/kaxufume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1cecc7c5-ccd5-4cc7-a540-22c14affd18e/what_is_dialectical_behaviour_therapy.pdf
    • https://s3.amazonaws.com/welanisowari/bdmv_player_android.pdf
    • https://uploads.strikinglycdn.com/files/b3ec8f3b-c1bd-485f-bf8e-8cc15e70e113/how_do_i_know_my_ps_vita_is_charging.pdf
    • https://s3.amazonaws.com/pevarijidasalop/left_centre_right_wild_dice_game.pdf
    • https://uploads.strikinglycdn.com/files/dfce1ff8-fb1d-44d6-90c7-67d43d76e585/dasovisipibosajamajowos.pdf
    • https://uploads.strikinglycdn.com/files/b2b5296f-d8ef-49d3-9ac6-faf5e1592133/lineamientos_del_consejo_de_participacion_social_2019.pdf
    • https://uploads.strikinglycdn.com/files/7e4a582a-ac51-4f5f-882d-1592290f63ca/2012_toyota_highlander_limited_for_sale_in_nigeria.pdf
    • https://uploads.strikinglycdn.com/files/33e9077f-2679-4a0b-8ee3-ca264c7a9597/nulexizupofisuri.pdf
    • https://uploads.strikinglycdn.com/files/5ef9fed9-419d-4aed-873d-4227433d12a7/88310486543.pdf
    • https://uploads.strikinglycdn.com/files/b57cd3d3-1ace-4ce3-ac2d-c3549840b38c/46326984502.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e9.bin
4ba536b747f338f4e7a5b2a5a9c522ce8d7249e7d7fc66b76b75ed91e6520879		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 5272 bytes
font_01_sfnt_off0000f9cc.bin
5904ad63ec4d282f54e5e0b57ee7b85df533c04cde48995b40901ec399bc3c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 11016 bytes

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