Malicious PDF — malware analysis report

Static analysis result for SHA-256 af75db419baebd84…

MALICIOUS

PDF

86.1 KB Created: 2021-09-19 17:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: edd707f0f9533369493287d33a317c52 SHA-1: 62d7b2d90195679895d1fddf55194456483d5fae SHA-256: af75db419baebd84db113337f79426dd282a12329f43623904d493dbdcb9b2e6
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier flagged it with high confidence. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate it functions as a link farm, directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=words+that+have+k+in+them PDF link annotation
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/61148319074.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/jamotibarifesusefixuru.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/kofuzatakorezapedu.pdfIn PDF document text
    • https://ismart99.net/upload/files/bajava.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/dexuzuvafe.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/71377682026.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/89383200782.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/29429169414.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/85876856137.pdfIn PDF document text
    • https://somogyplusz.hu/files/40110240845.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/bemizuwesogejafako.pdfIn PDF document text
    • http://yanartextil.com/firma/files/54500000484.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/wagenapegorefosuxorowulir.pdfIn PDF document text
    • http://prosquash.by/data/gotikakura.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/29083287291.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/kowanovugob.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/vaduweb.pdfIn PDF document text
    • http://edallyshop.com/upload/files/jetitiw.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/lowigefevajodebajen.pdfIn PDF document text
    • http://hk-keber.de/images/file/75340672119.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/damerajakepivo.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/38970494772.pdfIn PDF document text
    • http://tianfonmm.com/d/files/51741284894.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_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 18748 bytes
SHA-256: 2c671a3fe12326fb3f46f7b84350251e271a85851ebe966037aea573ce7b37a3
font_01_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 10620 bytes
SHA-256: 89b74732f037e869641b1509caa2c3bb68855d6b5e8c790974d1aa8be505e349

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