Malicious PDF — malware analysis report

Static analysis result for SHA-256 91694f80fc002d56…

MALICIOUS

PDF

92.2 KB Created: 2021-10-06 00:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 37f14f4afb1684bfd34c7fc497307b89 SHA-1: 60b30e5ab085a1ec50e2258e1059d823b5d15948 SHA-256: 91694f80fc002d56eb003d199bd19c78cfa77627b007cae84b3ee0cdabbdc847
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content or phish for information. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://petek.biz/resimler/files/fevuvatisupididitet.pdf In PDF document text
    • http://bochkari1.ru/pic/file/11444026724.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/25655605485.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/dabebimibarab.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/zetuzojejorexor.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/mamenivatalazenanokowati.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/siwikatenajugagudoruke.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/14324511538.pdfIn PDF document text
    • http://ombs.ru/uploads/files/dopodifamukinufegoj.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210914005225398644.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/punoretidonegetopebejub.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/kobolewijidinunipaliwob.pdfIn PDF document text
    • http://www.heksan.com.pl/file/zazofe.pdfIn PDF document text
    • https://evenements.gipso.org/ckfinder/userfiles/files/lodizevigi.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/xiwuz.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/79971380759.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/dotekexuk.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/75917443638.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/marorosimiwebikuj.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/losonelun.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/91784538475.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/77443203946.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/72310523573.pdfIn PDF document text
    • http://alvitraders.com/files/30301994488.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/73931371632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pennywise+it+2PDF link annotation
    • 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_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 20436 bytes
SHA-256: 76081a3bb68f309a3c8539b97375311a0e1c9e114a7e1ac24241a391a51dcf85
font_02_sfnt_off00014ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CED 9992 bytes
SHA-256: 978d0e219b07fe63e5ad244cda797c68a8cf7e69b7487bb4c93d28bbf450e536

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