Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d1de063c9ddcd4…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 09:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dca6e0f104d7f1116d2f36f2b0019601 SHA-1: 7871fcd8e73fb8f1b1993bed9bcbe3ace3ec5d6e SHA-256: 40d1de063c9ddcd481f6796388d6f4d4d4c9a36969a90928c74df29088d19ae1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on various domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://zhongjiukeji.com/upload_fck/file/2021-9-11/20210911103222375820.pdf In PDF document text
    • http://arucax.am/user_images/file/bovesag.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/54426001839.pdfIn PDF document text
    • http://apex-architect.ru/images/file/ginamunuwojazajedibu.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/raviwapevisevimefew.pdfIn PDF document text
    • http://elma1.ru/!upload/files/38731499980.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/vomizomumugot.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/nogekalet.pdfIn PDF document text
    • http://pjteam.hu/uploads/nufonesinemexixola.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/17101795079.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/ruvuvafadi.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/5069094784.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/zupuzadoxevila.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xadomozidijoxogo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf4a71024---giboboxitamefadosetop.pdfIn PDF document text
    • https://equinox-e.com/upload/files/83937378123.pdfIn PDF document text
    • https://thietbigas.net/media/files/lemegirusi.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///64630455780.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/47283378467.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/8138919156.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/50025ddb3504a99097ccd16acf7d9a03/70337193753.pdfIn PDF document text
    • http://3asoft.vn/img/files/kemuxajiwelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+see+saved+wifi+password+in+phonePDF 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_off0000c3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 17816 bytes
SHA-256: ec171d7c598bb2c6f30eecc1b58ebd055eb3633dc3dfebb0890743705a0f978a
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 10692 bytes
SHA-256: cee86670640594b2392281ba708f923aaa1a092c449e8d7d2dc55ed87b186934

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