Malicious PDF — malware analysis report

Static analysis result for SHA-256 0669401d59f7bed7…

MALICIOUS

PDF

101.8 KB Created: 2021-09-09 04:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6db53aaab26b3bef081df28c81265d33 SHA-1: 4ed92e408089430154b483f82651c1d7d7a6619c SHA-256: 0669401d59f7bed7727d1cfbe90b7fe292b73822b1db28fd60240615377c9085
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting and appears to function as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cructi.ru/uplcv?utm_term=masaan+watch+online PDF link annotation
    • http://hosungtour.com/FileData/ckfinder/files/20210903_20DF35660AE2E3EC.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/tavedeganiro.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/41718287605.pdfIn PDF document text
    • http://teknis.it/userfiles/files/tewimivipisoragabozemive.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/43326485689.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/xiximadidigonupen.pdfIn PDF document text
    • http://rsentco.com/upload/file/73114154631.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613647dfe88f5---tolodufumalixurowe.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///nugujidujinefiximakagefu.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090817161466.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/68246959043.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161300431cfeb1---22770789352.pdfIn PDF document text
    • https://unitjaya.com/contents/files/31816788739.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210903135401.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210902_0553ABFFBA6D47D4.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/volupumad.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/7183852389.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/pozurarata.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/70242771616.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/bubikemikojuzobutonukome.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/47434380103.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_off00012a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A54 18520 bytes
SHA-256: 234ef917baf14eea3d27ca1da403ff246e9685505fe7757270be33343dd199ab
font_01_sfnt_off00015a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A84 10308 bytes
SHA-256: 542cf70dd8b019bf4736b20680653425a58f2ad186bce010fe3d629bf0483e80
font_02_sfnt_off000171bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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