Malicious PDF — malware analysis report

Static analysis result for SHA-256 355a851798e57423…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 17:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f182ac9214631a3432f96b763ce1c74e SHA-1: c91254b1bc3e0fe2f2755840d2518397e1ef0913 SHA-256: 355a851798e57423dade594456ae6d8b13c55460f776bd4334d8218fb1b25a3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which appear to be disposable hosting. Heuristics indicate this PDF is a link farm designed to redirect users, consistent with phishing or malware distribution tactics. ClamAV and ML classifiers strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://inwebjor.ru/uplcv?utm_term=multiplayer+android+games+for+family PDF link annotation
    • http://k1a.ru/images/files/file/sunub.pdfIn PDF document text
    • http://ip-kamery.cz/files/file/1348474522.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/timapawigapaxariranomedu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614800281b0de---xusavanusopobowokop.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/16002902108.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6641efa1---zumof.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/luzagitakitafegakeribi.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210908011129_1y5973.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/satenezabejezo.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/larodomodopabasepalubon.pdfIn PDF document text
    • http://safarang.com/basefile/files/25448419581.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/170255486919.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109160009441573.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/21316699328.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/fapitirilimijeguvuwu.pdfIn PDF document text
    • https://edarky.net/data/file/bakabipuzalip.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/60775567547.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/79924970091.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/4369544943.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210910205130_385078467.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/93759648306.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/gevenezoxelip.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 11048 bytes
SHA-256: 0e87c9d787e49aab18e320504237c749a24dde5822d32547370620137ab12fae
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 17312 bytes
SHA-256: 060b140a0720c14441846406f33c2239bc8b78ad50204d7035a0404833739aa9
font_02_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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