Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fb3c3f7c56746d…

MALICIOUS

PDF

90.4 KB Created: 2021-03-24 21:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 31fd17fc4a1e986f5b4707ee30dd913c SHA-1: 71b188209dbdb916301eaf4049c93f3ec70cdbcb SHA-256: a8fb3c3f7c56746d5ddc0d25fca2e1a5ff3b45a31c862bcc9a8ff95805702a95
156 Risk Score

Malware Insights

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

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 0.9991

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 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.
  • 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://resalured.ru/strik?utm_term=free+online+spring+framework+training PDF link annotation
    • https://cdn.sqhk.co/niramojiga/fdn5Mih/fake_nails_done_at_home_without_acetone.pdfIn PDF document text
    • http://viewcreditscore.info/how_do_i_get_my_brother_printer_to_print_black_onlyb9yw3.pdfIn PDF document text
    • http://dress-russia.ru/pamexepldzw2.pdfIn PDF document text
    • https://cdn.sqhk.co/ziveluki/QihmHrE/silewinaletawuvudim.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxaroposa/gebJ4vv/pemoviguvebazosut.pdfIn PDF document text
    • http://inostrana.com/78640214729ktg0k.pdfIn PDF document text
    • http://particulieres-societegenerale.best/jejalakeb0c4.pdfIn PDF document text
    • http://toppiksnack.xyz/lotr_return_of_the_king_extended_edition_lengtha5pyr.pdfIn PDF document text
    • https://cdn.sqhk.co/tofegejij/jjKheNh/74093267680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/applications_of_nozzles_and_diffusers.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_a07b49c3dafc4d53afde86281c285ccc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/68581976486.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/rs07_grotesque_guardians_guide.pdfIn PDF document text
    • https://457cefd1-268f-49c0-9ca4-ced5ac281e6b.filesusr.com/ugd/983758_3e1d007a4b294a0eb97c9c09ae89a66c.pdf?index=trueIn PDF document text
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_a89641557e194f14a1f46463bb6a2959.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_d5532a67fe4040debe8a169976a84917.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/99467493449.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/13285049816.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/vukimevur.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/change_din_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/bogoxutusigopefo.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/somumiminima.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/84130023522.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/50757271415.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/after_effects_particles_plugins_free.pdfIn 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_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 5332 bytes
SHA-256: 03f891808fd3916c80f87d0f9e935c3ff8368585e57fd035eb71da3a3b32a838
font_01_sfnt_off000134be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 11444 bytes
SHA-256: d8002b7ac3968d803df5a636c9e0ceef95fa3fc61d3daaa1151ad921d8fed408

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