Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8842b4e9381052…

MALICIOUS

PDF

79.3 KB Created: 2021-03-21 03:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2691b44fccdb289bf603c43717d58e7 SHA-1: 7e250923aef5fe940cb55204351512f8ff00928b SHA-256: 0e8842b4e9381052123aceaf0d69c2274a525fbe46ae390f44bc4beafe96ece1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. One of the primary URLs extracted is 'https://jacksth.ru/strik?utm_term=purple+is+my+favorite+color+meme'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=purple+is+my+favorite+color+meme
    • https://cdn.sqhk.co/molivovuki/cN4Xxjj/diragagoruxawaxogamigip.pdf
    • http://pajodumu.22web.org/como_llenar_una_carta_de_poder.pdf
    • https://ruxunomitebapat.weebly.com/uploads/1/3/1/6/131606858/855657.pdf
    • https://nefixesuxu.weebly.com/uploads/1/3/0/9/130969456/lalegezetuk.pdf
    • https://cdn.sqhk.co/kefivaxepaj/f59006z/sazozibatonimoxugovenan.pdf
    • https://cdn.sqhk.co/mowasikuso/iaghUhf/rome_total_war_barbarian_invasion_factions.pdf
    • https://fumirufax.weebly.com/uploads/1/3/1/8/131856188/3959276.pdf
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/4175494.pdf
    • https://cdn.sqhk.co/pimidima/vhfisTf/mlb_standings_2018-_19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tinezedu/kuwoxuviwowejofonisatu.pdf
    • https://s3.amazonaws.com/bajuse/jurnal_preparat_apus_darah.pdf
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_9431b2ebabb240b3989bb835ce63222b.pdf?index=true
    • https://s3.amazonaws.com/tanapilamaxi/alogliptin-_metformin_weight_loss.pdf
    • https://s3.amazonaws.com/pegozegi/conscious_sedation_guidelines_2018.pdf
    • https://s3.amazonaws.com/fogibi/performance_appraisal_sales_personnel.pdf
    • https://s3.amazonaws.com/bupijila/25th_anniversary_invites_templates.pdf
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_1e6a940f94f24bbb8e8f10041ff2614b.pdf?index=true
    • http://rokodukewab.epizy.com/dunkin_donuts_caramel_turtle_iced_coffee_recipe.pdf
    • https://s3.amazonaws.com/lotibabakuj/network_support_engineer_interview_questions.pdf
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_b6277641053444ce904921befc2f96a6.pdf?index=true
    • https://s3.amazonaws.com/kavifunaruvi/62198203588.pdf
    • http://xokokikiz.epizy.com/maplestory_patch_file_corrupt.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_off0000f798.bin
9b2adb26b7bd6e46d1ee7d537a6806ff0f7a4a80006b6aa91911e123ee81c943		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 5324 bytes
font_01_sfnt_off000109ae.bin
f1d00a72d23d7a9a0955e1978f1482c9291f82a67a98a2c4fe08c8accf432ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 11180 bytes

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