Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce2b70c606a4c51…

MALICIOUS

PDF

90.7 KB Created: 2021-04-10 11:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7549724c1e91b46e9cceecefb04f758f SHA-1: e3ee72e78e2d8816813dc243ee9e1bc9cdb7069d SHA-256: dce2b70c606a4c51940c420bebf03902e7ba88c16b124700895baa725961ff70
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to a 'Midea instachef pressure cooker manual'. The presence of embedded URLs and the ML classifier's high confidence score strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=midea+instachef+pressure+cooker+manual
    • http://cardioactiveuficiale.site/ponto_de_encontro_student_activities_manualjfxdy.pdf
    • http://brumbum3.xyz/pobeboxuzupubadilovances6m.pdf
    • https://teparapilaw.weebly.com/uploads/1/3/4/4/134477765/8a6e8c0f833169e.pdf
    • https://naxozafo.weebly.com/uploads/1/3/1/4/131483391/polejizetokir.pdf
    • https://bowalizixoled.weebly.com/uploads/1/3/1/8/131872289/a107f3e55a3cc22.pdf
    • https://vowizata.weebly.com/uploads/1/3/1/8/131856430/7162501.pdf
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/83463.pdf
    • https://dulijijinigukal.weebly.com/uploads/1/3/5/2/135297200/8a10d8ef563.pdf
    • https://demiwuvaduze.weebly.com/uploads/1/3/4/9/134904833/lilixeg.pdf
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/8726734.pdf
    • https://remitibomuko.weebly.com/uploads/1/3/4/8/134853657/delapipas-mesumolexinex-lepop-lameb.pdf
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/6cf6bd9b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_d8f010e6638f40349bac319d08ac4d0e.pdf?index=true
    • https://s3.amazonaws.com/votuweroxigezog/tnm_staging_for_colorectal_cancer_7th_edition.pdf
    • https://s3.amazonaws.com/nilafafakem/que_quiere_decir_platon_con_el_mito_de_la_caverna.pdf
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_5f29b1240e434647b10a6f89d25c98b8.pdf?index=true
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_87971046c2d84575b2cbb1629346dd6e.pdf?index=true
    • https://s3.amazonaws.com/tesasubawalozan/36848763607.pdf
    • https://s3.amazonaws.com/gavobawum/aomori_city_travel_guide.pdf
    • https://uploads.strikinglycdn.com/files/623a444f-4149-4daa-8078-25b69352a280/jesavawepopunerimopivuze.pdf
    • https://uploads.strikinglycdn.com/files/1afe4a93-e647-41dd-b3e0-1e88982a89d7/digesifipubaw.pdf
    • https://s3.amazonaws.com/nijosinizo/66375047602.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010418.bin
73e17589be2e5d894ddb1566600b0c4419794e235357829c93cc1969e51f9b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 5464 bytes
font_01_sfnt_off0001168a.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 1800 bytes
font_02_sfnt_off00011f18.bin
8856db42c73fa7e3865c64e9048aa6f11d7d27265221ded1e9b157d4f3f2b0c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 11372 bytes
font_03_sfnt_off000145cd.bin
fc9f91264f0f636e012862a01c17031fa6c8ef83522afadfba15150cd6d92edb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145CD 16972 bytes

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