Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8b18b09ff2a654…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 23:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d9f79ea5cdaebf4206f5db5487e53c5 SHA-1: 6fd829c8633f6c72f2b3713d271aee71eaa73ce1 SHA-256: 6b8b18b09ff2a654b5a9b2d4fb7bc098380d378c8cb32372bffcfe15589026ce
136 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm or SEO spam, with numerous external links embedded within its content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to manipulate search engine rankings or direct users to malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of embedded URLs and the overall structure point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ponafet.ru/strik?utm_term=best+mindfulness+colouring+books+for+adults
    • http://xurekurise.iblogger.org/what_problems_can_high_blood_pressure_cause_during_pregnancy.pdf
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/vanadujebi_dafimakoviruma_fiwefazoxej.pdf
    • https://cdn.sqhk.co/tinulafi/zhfiehd/beyblade_burst_rivals_ios_download.pdf
    • http://bonifacy.site/36567212278rqd9y.pdf
    • http://giocodigital.space/pizunakunitokefusogernal86.pdf
    • http://vigastlens.xyz/is_curl_activator_good_for_natural_hairr5aee.pdf
    • https://cdn.sqhk.co/dubikureta/i9p0Y6D/hack_space_wingmen.pdf
    • https://kovelikazaw.weebly.com/uploads/1/3/4/7/134705675/zevimumeromag-lemarazi.pdf
    • https://babaperivagam.weebly.com/uploads/1/3/1/3/131379833/0c9a7ba81199d70.pdf
    • https://gojojiwegojefuw.weebly.com/uploads/1/3/2/6/132695574/duzizoranak_japodo_xijowusime_zezokoxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gotapomoleza.epizy.com/how_much_is_a_2015_jeep_wrangler_rubicon.pdf
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_928806f9823c41da8c8fdc78c6629515.pdf?index=true
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_71cc07cacd3c451b9c855a8b68679381.pdf?index=true
    • https://s3.amazonaws.com/rujabepifar/seamless_transitions_for_premiere_pro_tutorial.pdf
    • https://s3.amazonaws.com/bidivo/dictionary_oxford_apk.pdf
    • https://06b91503-bda4-4bbd-a69c-520552d4e402.filesusr.com/ugd/07c5d0_d2fc1f01f02b459499981476946d48cc.pdf?index=true
    • https://s3.amazonaws.com/jadudusujuje/9035092384.pdf
    • http://lokanubuxona.rf.gd/21932489130.pdf
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_2917fbda632e465d9692f5edd7742826.pdf?index=true
    • https://s3.amazonaws.com/nitajosasa/milefasinanugazabud.pdf
    • 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_off0000f02e.bin
eac2c7a4bc4cf4324aaaa645534bee61cd2d64ef5f96aabe02d445df9a3b0e66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 5592 bytes
font_01_sfnt_off0001031f.bin
dfde1c103710e9647d781105fd29a1c115f12b61f60c931c5082e5e5ae3936d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 10368 bytes

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