Malicious PDF — malware analysis report

Static analysis result for SHA-256 052291212414e026…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 11:13:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 955d53b0641cf3a728502d1828b06931 SHA-1: 6584819cb3b4ab00d6566c51bbd835dc637365db SHA-256: 052291212414e02664669103dc3aa2136927f4fbd3c49a7a18e6156c7637d0bb
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 are to benign-looking PDF files, but one is to a suspicious domain (xajibur.ru). The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect the user to malicious content.

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://xajibur.ru/123?utm_term=built+in+oven+size+guide
    • https://cdn.sqhk.co/zejejofe/TjbZzii/text_message_sound_for_my_phone.pdf
    • https://cdn.sqhk.co/fowizolomam/Jibf8dF/syrup_and_the_ultimate_sweet_toffee.pdf
    • http://game-pro.xyz/59510795689sm7yu.pdf
    • http://wisecreditscore.info/46148706069exwr5.pdf
    • https://cdn.sqhk.co/javeduner/eijjWPk/live_cricket_match_world_cup_2019_online.pdf
    • https://cdn.sqhk.co/rawerusiwala/snsif55/voxaditeretinalinon.pdf
    • https://cdn.sqhk.co/wekaradukuve/Pid2Kie/top_trending_hashtags_on_instagram_2020.pdf
    • https://cdn.sqhk.co/laxefotogulo/p9W8haa/zumuduxufolaxirusinivepa.pdf
    • https://cdn.sqhk.co/wifinalimow/4S2jhjj/black_screen_door_lowes.pdf
    • http://detodefinedex.22web.org/messenger_lite_apps_2018.pdf
    • http://zobosebavasagid.iblogger.org/fabedap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_ce118650c05c4f0c865706d7492aa14b.pdf?index=true
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_d6d92e0642e849c2bf8f5346d907ac7a.pdf?index=true
    • http://wolixebob.rf.gd/bildschirm_drehen_android_9_s8.pdf
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_96d1800c87bf4a3493e17115e1b3e121.pdf?index=true
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_37b818330cc5488c8e3755db0753db6c.pdf?index=true
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_984f5100d870474dbd52fef71b1b5424.pdf?index=true
    • http://vupikefugogulup.epizy.com/aws_cli_command_from_s3.pdf
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_5fb964fd6a5b4066a7819b3869c2cb45.pdf?index=true
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_1a9730be55a64317b829ffefe7a39e68.pdf?index=true
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_539405130fc7466aaa70045fc39af2ab.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_off0000fb77.bin
2d7ee0054477d65349373e8dcceb26073462d08b45e234b652efb1defc3602c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 4848 bytes
font_01_sfnt_off00010c1e.bin
9ab4d12d6fdc7137e0cf53265e145098536c86f704cb0e29b49d1af8b6c2d967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 10328 bytes

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