Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3471387b77c4a10…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 20:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5aac13d8a0e5a2eae9251f82e10a020f SHA-1: 1d0ef49235ea409e3048e296149589547416e447 SHA-256: c3471387b77c4a1096038502894e564ab1ef066742f6f54a822a03cde00dba2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on potentially untrusted hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/54f5c302161409422a69d8263f29b8ac/55319594118.pdf In PDF document text
    • http://ketoanantamhcm.com/uploads/files/liwuxowu.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/61292529706.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/77576109376.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/89404164777.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/48726879925.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210917195616.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/dudufekumolapuzapevew.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f7f796ec6---lenobibuvovizelejenubaje.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/wibuzokazobo.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/12990160354.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/zuzizexidilukuk.pdfIn PDF document text
    • http://nenorm.com/files/files/vujafamelipomudewu.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/fuzofabugifu.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/89781051506.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/zipefozazawezuv.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/nigijoluxexijusutatax.pdfIn PDF document text
    • http://abwrva.com/uploads/files/miruwiwemaperamukoro.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/pegew.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/52193952422.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/6876905828.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/17851699379.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/18541912138.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/vimosigun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=altius+golf+and+the+fighter+brand+pdfPDF link annotation
    • 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_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 17468 bytes
SHA-256: 56b20cf830b5a0aec553602a1e623d61a02aeff3c06d9555e5121f733fd0a594
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 10996 bytes
SHA-256: 42ef54b8318fbdc40550542b66aab0bc27f303f5585ce94c5a1605971e735843

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