Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b564dc5463b65a8…

MALICIOUS

PDF

68.7 KB Created: 2021-09-10 07:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6f08b813689e6daac6cf6eea1837398 SHA-1: 9c42b527e8a4c87d58a6c234b25a83c5e6fa06f1 SHA-256: 2b564dc5463b65a8c3720ebce76411f315c7cb94320353972ccf9f3cf6fc377f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious 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://vnjhanoi.com/upload/files/danivovuzi.pdf In PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/27368629171.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca85797b8---nenesegedaza.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/96946308801.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/jeponuwagawaruwusawed.pdfIn PDF document text
    • https://heureka-cz.eu/files/36735367099.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/28822191899.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/61755708875.pdfIn PDF document text
    • http://scpt.it/userfiles/files/nerufonutelovub.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/mexakifofetagaxepidabiv.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cb86124ad15f09f4f0f4a2ebcb089489/68499379608.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/88117727100.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/vufeb.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/58280210170.pdfIn PDF document text
    • http://edeins.com/userfiles/file/465203866.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/45320073535.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/93482808450.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/11286008092.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/83272649480.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/8052901133.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/17670804073.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/busitav.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/weruzoroladovikefojuxat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=speed+post+tracking+raipurPDF 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_off0000af29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC740 10908 bytes
SHA-256: 68c7e408dee87e235ddaa56030b3baae309a16dface0f63c8e284e58c6a2ad8c
font_02_sfnt_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 14980 bytes
SHA-256: e156d1e3d19c1d196fc73ff17ad934945102cdf2a806eee7b426bb4467fdc0e1

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