Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af53830a02a959c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 15:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a2e1384a1ac080808bdea1bd3f99576 SHA-1: 99ab31e793e72ca682473151439357d903ce8c6c SHA-256: 9af53830a02a959ce3e0a17bdbbc36fa3719f0fe538d0edccc0d37107b023089
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://jjw-led.com/userfiles/file/gujimifaravubavaxam.pdf In PDF document text
    • https://birudongker.com/contents/files/kurir.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/70433202387.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613430911bf70---94819970934.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/93677745108.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/tixixibekodovimitiderab.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/kotugufonelamirobarote.pdfIn PDF document text
    • http://skolky.info/foto/images/file/73391068648.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/jepavijirukigigon.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/69613400844.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/5409361344.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/98988027324.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/razexadoxudu.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/fetijifonowigutopikotifub.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/naligalotavamuv.pdfIn PDF document text
    • http://taociren.com/upload/file/210904125633728252yb8for2gnumy.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/relugirekowaleko.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/95351826620.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/kifajaxumuribe.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/paxorozif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hikvision+4+port+poe+switch+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_off0000ca2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 19472 bytes
SHA-256: 11aaf66d26522464915f71e3663577c7c7f9f7c8099d53285f6de36d2d6bf8c6
font_02_sfnt_off0001147c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147C 10820 bytes
SHA-256: 88dfb2e2cf0602b3c388a99f3c8a880accb98c78892ce9bf60a6f3b8c5c869b9

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