Malicious PDF — malware analysis report

Static analysis result for SHA-256 db92ab28fae07cc2…

MALICIOUS

PDF

85.6 KB Created: 2021-03-28 08:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba926f79fc4779151142b58c5bcfa4df SHA-1: 226cd7082a4fc1b3d8756a9489122f96bf3be3b4 SHA-256: db92ab28fae07cc2bd4c08bfd31347f81ac41d4c89cd739db120efc179918643
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to improve search engine rankings or distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/wix?keyword=samsung+wisenet+security+system+manual
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/wavafuwegiduz.pdf
    • https://jaxenexeleti.weebly.com/uploads/1/3/5/3/135320290/kojuvekixirabax.pdf
    • https://cdn.sqhk.co/jirowolad/hfyihcI/94601317333.pdf
    • http://sisamow.iblogger.org/functionalist_perspective_on_family.pdf
    • https://cdn.sqhk.co/rujojumex/igfdgfX/blackplayer_free_mp3_player_apk.pdf
    • https://cdn.sqhk.co/rinovizifim/drghhfE/boradijunidunorid.pdf
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/lakozodol.pdf
    • https://rakamirun.weebly.com/uploads/1/3/4/9/134904708/jixibojobi.pdf
    • https://mebodamuruwij.weebly.com/uploads/1/3/5/4/135400263/2c85b7eb4.pdf
    • https://sopoxovolofu.weebly.com/uploads/1/3/4/5/134509961/pupadixokuxovi-zolido-kebufipifekelu-derisadat.pdf
    • https://cdn.sqhk.co/xokekekav/gduijp4/sofodaravoviboluli.pdf
    • https://cdn.sqhk.co/dinigivo/jhXjhid/steampunk_goggles_drawing.pdf
    • https://cdn.sqhk.co/zibomevuguli/fQDhcMl/fruit_cut_slice_master_app_download.pdf
    • https://cdn.sqhk.co/jigekuragige/Ygigg65/nopog.pdf
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/kegevilaxixage_rewesuxamemebe_ravud_veselide.pdf
    • https://cdn.sqhk.co/pigevikuwi/qx2UIhh/58317950442.pdf
    • https://cdn.sqhk.co/relaberof/hiXgjhj/the_great_courses_free_shipping_code.pdf
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/4795107.pdf
    • https://cdn.sqhk.co/moviferu/hbhjgfz/levuvixidagilaremewe.pdf
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/9021247.pdf
    • https://cdn.sqhk.co/sigidezok/cw9iigU/daniel_tiger_s_neighborhood_explore_the_outdoors_dvd.pdf
    • http://lusivemewuza.22web.org/budaya_jawa.pdf
    • https://cdn.sqhk.co/jinubodilev/yhg9xjb/vonerevadugiwavupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000111b9.bin
b68bd097e4fd87f2d13132ade23ef5f669c04c94b67f5f183feae787d28ed551		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 5416 bytes
font_01_sfnt_off00012423.bin
8a36bc9ca52021e4e8a3be5fd1cc7cf854d2ffffc05039f59355c8f19e732ac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12423 10804 bytes

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