Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c4360f312c258f…

MALICIOUS

PDF

78.6 KB Created: 2021-03-17 16:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b0789abc082866762ec7bb796717b55 SHA-1: d9610639ace611a80640d1729cb31013933eb0f5 SHA-256: 56c4360f312c258f65ddc6ea2b87927eaff9f280e9bf04d682beff0b16198de1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm used to obscure the ultimate malicious destination. One of the primary external URIs, 'https://vilenefex.ru/award?keyword=anlage+g+2020+formular+pdf+ausf%25C3%25BCllbar', appears to be a lure for users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=anlage+g+2020+formular+pdf+ausf%25C3%25BCllbar
    • http://dumubemajizukov.medianewsonline.com/can_i_upload_my_dna_from_myheritage_to_23andme.pdf
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/1367f7336b2d.pdf
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/1a7ef7cd498.pdf
    • http://sbrf.link/shunt_reactor_design9p3qn.pdf
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/bupipasata.pdf
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/pagexarevob.pdf
    • https://zosojelukik.weebly.com/uploads/1/3/1/8/131871698/jefisenudowukol.pdf
    • http://solent.bar/41198675773shgll.pdf
    • https://fojugifobuko.weebly.com/uploads/1/3/5/3/135328464/5251061.pdf
    • http://dofujifeluradep.medianewsonline.com/xutipejup.pdf
    • https://gumozudisi.weebly.com/uploads/1/3/0/8/130814032/tixexanofiwegiso.pdf
    • http://dkmz1.club/paper_roll_sheet_cutting_machineiixab.pdf
    • http://idealicaitaly-ufficiale.site/ketifikanetewirusesiu32vk.pdf
    • https://tukevepa.weebly.com/uploads/1/3/0/8/130814993/d517db0dad5ef3a.pdf
    • http://viniveba.mywebcommunity.org/kodolete.pdf
    • https://vejevidumuruje.weebly.com/uploads/1/3/5/3/135302175/benawiluzogel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jolunenafobuw/87122225608.pdf
    • https://s3.amazonaws.com/tazopaju/70581644660.pdf
    • https://s3.amazonaws.com/fadupazageraf/98082073030.pdf
    • https://s3.amazonaws.com/mogedozara/budovufobim.pdf
    • https://s3.amazonaws.com/wupiwupiwot/66042351713.pdf
    • https://s3.amazonaws.com/winumigutam/13174755366.pdf
    • https://s3.amazonaws.com/vovuzize/linksys_e3200_setup_without_cd.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_off0000f1dd.bin
42bbd4c6dd73dfae4de3f924a57135d7eac33625347ab238a8d00d8812bee379		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 5884 bytes
font_01_sfnt_off0001059a.bin
2946e355a12f9de401d728a35d2d3edf6d776f73511fbbefa01f8c902a3adcdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 11424 bytes

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