Malicious PDF — malware analysis report

Static analysis result for SHA-256 a537cfd644df5aa2…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 08:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72ed19fdffd0e71456a12b9846dc118e SHA-1: 7e0755c1729ab59e40435054ad695c79bda77ab2 SHA-256: a537cfd644df5aa2a7e5c740991fc127e85cfbee633e0a08e5ee7643fabcf3ec
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm on disposable hosting. Numerous embedded URLs point to potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. No scripts were extracted, but the overall structure and URL distribution strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=pathayorangale+mp3+song+download PDF link annotation
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/845108378.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/nubowisitaguvokevi.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/rijux.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/31201175358.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/82487810363.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/kaxedolo.pdfIn PDF document text
    • https://educhina.mn/editor/files/80712717955.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/4cab344458005c9d4b44b85127e8a565/kifutamadagowi.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/pugoloxekujat.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/50206678651.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/47379043891.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nilazotowesiwag.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/gejemapu.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/repetefeneruzifugiredibal.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/bomoxumujabojopil.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/89102325405.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/fijawavetanofusojufozadu.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/dexowutemavubefuvomut.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/mumugabojolavegorumu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ccf7b4397---71605603753.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/23817803362.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/mawatinaporexi.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/87530182844.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_off0000b710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB710 15996 bytes
SHA-256: 48053461b536a28575fb6f00d44e9277516529f760c33a4b9cfaa2aeb826fb1a
font_01_sfnt_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 11120 bytes
SHA-256: 90cd218fc52c14e6b31f8071cc2b669f4f5f7141aedea9084feb498a9facaa9b

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