Malicious PDF — malware analysis report

Static analysis result for SHA-256 a033b9bf96cfd13a…

MALICIOUS

PDF

68.5 KB Created: 2021-03-10 01:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e071105a5d81fa4072b3f2f8e94896dc SHA-1: b193b085ce12c323b17f96582b863e1df5bc4848 SHA-256: a033b9bf96cfd13adba1c6688e07638734aaa47939c9c2de5d18dce1762e76ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=mr+christmas+outdoor+holiday+projector PDF link annotation
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/3fae6e1f8150.pdfIn PDF document text
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/wepedi-raworok-bedago-nufotixepedol.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/fAibP7q/3954738598.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/iay3riS/65705221919.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/how_to_attach_sleeves_to_a_crochet_sweater.pdfIn PDF document text
    • http://bekotuselol.22web.org/74356952496.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/27d957b.pdfIn PDF document text
    • https://cdn.sqhk.co/juxefirapuf/fyXZuTJ/eyedropper_in_excel_2016.pdfIn PDF document text
    • http://palupalukagu.mygamesonline.org/samsung_mu6070_wall_mount_screws.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/jJphaGM/93693568195.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/jimowifiralofepibemoledup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tasaronusofake.rf.gd/puretoranud.pdfIn PDF document text
    • http://zonuzaxesinok.rf.gd/kumekivoviduz.pdfIn PDF document text
    • http://folijurojavagig.epizy.com/84376611094.pdfIn PDF document text
    • http://malinaliwul.epizy.com/2mm_plastic_sheet_bunnings.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_37d73ea3c1034b4bb11abe622d6c07dc.pdf?index=trueIn PDF document text
    • http://rowabereduxafu.epizy.com/24359983326.pdfIn PDF document text
    • http://kimafixenij.epizy.com/argox_os-_214_plus_driver_xp.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_9bfdccab8c4543c2ab446341d46e2b7a.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 5496 bytes
SHA-256: ac3229c00802c1ec106f3eeb203067044fb33cd129a0217bf9032b5bc3cae848
font_01_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 10528 bytes
SHA-256: ed49a57411935179fb0187debb9fc0355d4ad14423003550e5555c01d90d9c84

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