Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c9b17a859c5e6e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 19:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2d4eb3c0bc398e8f7465b941c0eadb5 SHA-1: 0f900b3cc16c7dacee1db16e271929d116c2d644 SHA-256: d1c9b17a859c5e6e0ba201b0fe391913cacd6546b73df9ca19704a68ac3c70c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL distribution are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=how+to+find+the+vertex+of+a+linear+function PDF link annotation
    • http://myphamasia.net/upload/files/57257810062.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/31246152194.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/84632466273.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/83502154579.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/83196517521.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///gijuragaguwi.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/wodexerurifopigowif.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/mobetipisojomewoji.pdfIn PDF document text
    • http://irinabailey.com/upload/files/kafemisesota.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210914070112.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jonewar.pdfIn PDF document text
    • http://machulski.com/public/file/sufebal.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/kexufivofunap.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/takezotopasiratulemuz.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/73193661864.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/95941496439.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4280990794.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/jezegagole.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/jadofilusapokalirib.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/11960575437.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/95722788445.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/63266701150.pdfIn PDF document text
    • http://kechengchem.com/upload/files/mideju.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_off0000b06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06A 15012 bytes
SHA-256: 6436a10c2c2d6e9c935f00e59809082a9914c4862e00404f8891f17d761ccb34
font_01_sfnt_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 10748 bytes
SHA-256: cb8414c68d8b8a6850439314dfe9a481253065f6e6e4b5309898203ff953bdbd
font_02_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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