Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa985d835b9ddde…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 21:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8180a06587e7cb2f8ec864f4e1fa438d SHA-1: 3fc3d4ca585b922aa2f80024a653ef8d572cf1e9 SHA-256: 8fa985d835b9ddde111a42e7114fab4fceb82b10552943605146a01873453001
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external documents, many of which are also PDFs, suggesting a link farm designed to obscure the ultimate malicious destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wastran.ru/uplcv?utm_term=forgot+my+pin+to+unlock+my+phone PDF link annotation
    • http://mebelhotel.ru/userfiles/files/48827247817.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8039d7a0---22752665820.pdfIn PDF document text
    • https://reha.bg/content/upload/file/16171657839.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/dunozifekimudobovenuf.pdfIn PDF document text
    • http://gewald.ru/content/Files/12553313160.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/23900880635.pdfIn PDF document text
    • https://eniedu.com/data/file/20210916020621.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/zabatiduviritesenixa.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/zobidiwo.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/mixazuru.pdfIn PDF document text
    • http://keitbg.com/images/files/mivepirezewevetavi.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/balakesotijebaziwu.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/nuzumolivodusulo.pdfIn PDF document text
    • http://lawngo.net/fckfiles/64556931267.pdfIn PDF document text
    • http://grimastone.ru/files/nomizazuxuxuwovoxibuzewuw.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/63117539618.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/69131888329.pdfIn PDF document text
    • https://vendax.ro/files/file/mulim.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/72670155772.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/difakujenesavike.pdfIn PDF document text
    • https://dm288.com/slicice/file/4305506910.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/muwep.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_off0000bcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CF 18024 bytes
SHA-256: 958903b7ee5967c19cac31f5b073f9180b14859624269998db97f74fce1d68d3
font_02_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 10776 bytes
SHA-256: e4888c7311cea9b815df2ef61b1574499b01297f4460b3c5b2481735af31fb2f

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