Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f6fbeb638b67ab…

MALICIOUS

PDF

78.0 KB Created: 2021-03-27 19:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0f591d3491456534e032a6b7a111793a SHA-1: 9bf03784bea17479aaf046b30511d39c539fe871 SHA-256: 44f6fbeb638b67abd67d9befea44d83c65814616a9b27e333b40361a1571dc75
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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 7

  • 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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://kuzutuzo.ru/strik?utm_term=how+to+identify+surface+mount+components PDF link annotation
    • https://cdn.sqhk.co/xuwifoviwalo/fjegggj/cute_funny_stories_to_tell_your_girlfriend.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/K1hcRjc/madness_ball_downtown.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/vomemaxelozem-sajijomawex.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/dCq9icA/cisco_webex_meetings_virtual_background_mac.pdfIn PDF document text
    • https://bajixaxazuxu.weebly.com/uploads/1/3/1/3/131383864/gesiperumef_gegorimuwubu.pdfIn PDF document text
    • https://nedugebev.weebly.com/uploads/1/3/4/6/134602354/9805419.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/hg8mkhe/44352451185.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_67eeb1c99ab24c3fb7f4794ca999bde3.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_5818439443ff4448b020bce2f1649411.pdf?index=trueIn PDF document text
    • http://vigukesege.epizy.com/7451747238.pdfIn PDF document text
    • http://rudowaxenesi.rf.gd/what_is_statistical_communication_theory.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_0686ac92a19d428f903a0eaf040e8cc2.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_e4755b2fc1344e9ebcc48258b135d02f.pdf?index=trueIn PDF document text
    • http://fuxazulofonu.epizy.com/chrisette_michele_epiphany_album.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_5167fbaccd754056b92475f96fc74aea.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_082041b93ec64f92adf9f783e21d7e10.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_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 5424 bytes
SHA-256: ac5062268803921107b48fa76f28b6d6093206f089e143a252f1f8a7d34ae8bf
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 10896 bytes
SHA-256: d2afaa460ca022fb7808df3d8216437ba0365190c0362b175001e3eed03abf6f

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