Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6430db777e4f73a…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 08:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8790d57b024a5c466c92c6d77e3e432 SHA-1: f3a325ab6f140d4cdbece0e2c48afdf7417dba8c SHA-256: b6430db777e4f73afeb2fb8ab8776724c1317e54faa35bc66e5b5ffaf72f7f74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://coretry.ru/uplcv?utm_term=sochiye+aur+amir+baniye+pdf+download
    • http://ansonseatery.com/uploads/files/55329680496.pdf
    • https://kubermatkaplay.com/ckfinder/userfiles/files/67938665545.pdf
    • https://intersensor.ro/v2011/Files/fck_upload/file/12504991031.pdf
    • http://fiorenzuolatrack.it/userfiles/files/10814814859.pdf
    • https://accuratesearch.com/userfiles/file/togotovisurarem.pdf
    • http://telecycling.org/files/file/vajagajigakodi.pdf
    • https://stpatswatertown.org/ckfinder/userfiles/files/31138324488.pdf
    • http://inoxbienhoa.com/upload/files/sivesumudetes.pdf
    • http://avalon-essenzen.at/userfiles/file/84638454389.pdf
    • https://mokhalasati.com/userfiles/files/63697001876.pdf
    • http://inbond-cn.com/userfiles/file/84001563248.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a23081305907f87a6ba909b5d328bb84/rirefekuwuzilod.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614324cee4c03---94446903685.pdf
    • http://elitvorota.ru/f/file/xabaruwafifixun.pdf
    • http://retailpark.bg/uploads/wysiwyg/files/88623687017.pdf
    • https://stpm-sa.com/userfiles/file/47358245821.pdf
    • https://farmaciasacoor.com/site/upload/file/kekatakogujerukefesipaduz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3A 16792 bytes
font_01_sfnt_off0000c547.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC547 1680 bytes
font_02_sfnt_off0000cd44.bin
f65a8cca40eca030d197f47ca1731dbabec42881fcbb7775e249e361142c16e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD44 11136 bytes
font_03_sfnt_off0000e6e3.bin
ada88f22a8b3d9da4e8ad212ff222fcee632530013b82d8f1acba9d44a527aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 17628 bytes

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