Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49e93a8ab70d901…

MALICIOUS

PDF

76.4 KB Created: 2021-10-06 11:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: adc325b18dfae794bb94bad5de060ea2 SHA-1: ad8b1d358d36ace63b3fc019a03c6468ae684888 SHA-256: a49e93a8ab70d9017b27d4c435bd0fc8c5720c6020a609de85cd7efb0c24a5de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://catamma.ru/uplcv?utm_term=piping+plover+endangered PDF link annotation
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/59033011291.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/9373276020.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091522552961294.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/wewobiwoniparilizojut.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210913141420.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/jevamejeva.pdfIn PDF document text
    • http://bdsductri.com/upload/files/wamabifogubax.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/46289719858.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/nijugifamagemenoxofepiso.pdfIn PDF document text
    • https://taperagi.com/contents/files/duwuvigen.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/27428103166.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/4956715892.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16146f38a0331b---xarokefegetuf.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/puwoxunaruvaxozapamaw.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/nokewazeziroxorazus.pdfIn PDF document text
    • http://klenderbio.com/upload/files/79654313306.pdfIn PDF document text
    • https://jck.ro/userfiles/file/dinovojarisog.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sipo5lg7d3evs03otjj5mf5ids/kaxipumero.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/27558263969.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/55797661331.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_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 17472 bytes
SHA-256: d38d5915ceb1a680970755647f8500cf90a0a2dc0fbe5d75312e1810afca9db2
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 10368 bytes
SHA-256: c29d8ab28d17ce37d63adb823b8a22fef4a57000bc652ae25f0cf91866716f77
font_02_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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