Malicious PDF — malware analysis report

Static analysis result for SHA-256 94db22ed22792d66…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 20:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2e6845fb39b6af5dde80a2a567972ef SHA-1: 3581fc3d719f832657234e707103f0b2a203aed8 SHA-256: 94db22ed22792d6600a9011aa063a12313fef40598fbd73ea33675d94e2a2412
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Numerous external URIs were extracted, pointing to disposable hosting and likely serving as lures for phishing or malware downloads. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=turn+on+auto+rotate+android PDF link annotation
    • https://alpinashop.bg/files/xukalapak.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc91ec52f0---wezawozovebizitevepidow.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/daridoweveg.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/golutasivaka.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/38105669943.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/wereturuwipajavakol.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/76407543365.pdfIn PDF document text
    • http://findacommodity.com/upload/file/jorav.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133640232e79---31593073740.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/suxowereju.pdfIn PDF document text
    • https://oasis-travel.ro/files/64458879762.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/dulinasapebafa.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/gejomunotasotefe.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/51983631598.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/zilajowarajifime.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/51863903287.pdfIn PDF document text
    • http://benly-carson.com/product/files/33886696884.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/wubibarexuravojodifikuza.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/56498679505.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/51605020463.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/86905165563.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/91595013003.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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 17928 bytes
SHA-256: 5293643c9d2891e61dca867c24504e5d83c67b36425311d95355072ab8bd9600
font_02_sfnt_off000124a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 10092 bytes
SHA-256: 31d0c86d4a9fc2517b267a1f7956f4cbca87f5a494f6467cf9593433243b6e1e

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