Malicious PDF — malware analysis report

Static analysis result for SHA-256 647c60a6efe89350…

MALICIOUS

PDF

92.2 KB Created: 2021-10-07 17:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d02599c3de8b8f681e91edeb517509db SHA-1: 29d594ecc0ccce918c47ca0a2026073d46fc836d SHA-256: 647c60a6efe89350376b02dd05a344b24509dcaa353e08b58805c08a4fd956ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of distinct hosts and links, reinforcing the malicious intent of distributing traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=name+a+water+borne+diseases PDF link annotation
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/wufewexewizobavekevizo.pdfIn PDF document text
    • http://ore-processing.ru/d/files/37559447233.pdfIn PDF document text
    • http://maksimetall.ru/files/57229164270.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/rupaxejoganemosigenufol.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/16950007846.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/84071814505.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/78009041038.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/77860784156.pdfIn PDF document text
    • https://spyboarcams.com/files/15021848500.pdfIn PDF document text
    • https://kettosallampolgarsag.net/imagini_ws/60722691165.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/diwaresivudulofo.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/33763540983.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/rojelisobubazunuvus.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/bebiz.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/51585728094.pdfIn PDF document text
    • https://noitiethoc.com/userfiles/file/tasaliwepojusodixixiwel.pdfIn PDF document text
    • http://aotmoo.com/uploadfile/files/20210926_125955.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/28153368865.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/tenala.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/46411231387.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/45850738762.pdfIn PDF document text
    • https://unitjaya.com/contents/files/soluwi.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_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10564 bytes
SHA-256: 6de6d1440da95e7bb3b4280fd55d1342fd7dd87d40a331f726da2bea5133a6aa
font_01_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 19684 bytes
SHA-256: 4777a3d2f34cae519e2055c9a9699e2c1a4e563167484905184978008399d1b0
font_02_sfnt_off00014b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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