Malicious PDF — malware analysis report

Static analysis result for SHA-256 438686fe43bf5f67…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 21:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fda8c38ad7187f2c463e8fb346b81a20 SHA-1: 5e0118f3615368ec0f1a1a88142abeee150dcbcf SHA-256: 438686fe43bf5f6772806aec738e343659960c3847f827e9921c0e2ddc461c4e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or scam attempt. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates a lottery or parcel delivery scam. ClamAV detection and ML classification further support its malicious nature, likely serving as a lure for further malicious downloads or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://inwebjor.ru/uplcv?utm_term=motorola+droid+apps+store
    • http://imobilestore.de/userfiles/file/78801835383.pdf
    • http://unicaconsultoriarh.com/images/files/xifuf.pdf
    • https://karlholmbygg.se/UserFiles/files/18746796527.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e9078721---latawix.pdf
    • https://autohausnschmidt.de/userfiles/file/62006093994.pdf
    • http://mrcookie.tw/upload/editor/file/061508575548.pdf
    • http://telesson.net/_UploadFile/Images/file/91866509955.pdf
    • https://pyccenter.com/images/Upload/file/57471287411.pdf
    • http://tms-technology.com/ckfinder/userfiles/files/fetikugukerawi.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8a74e46e7258cd8634d74602f33431e0/63537729866.pdf
    • http://fszhenjia.com/upfolder/e/files/20210909140417.pdf
    • http://sztarmedia.hu/_user/file/68822964758.pdf
    • https://samajsutra.com/userfiles/files/68901717211.pdf
    • http://hcbarrett.com/user_area/file/47539066993.pdf
    • http://yuhenganquan.com/userfiles/file/20210908171353_1039240197.pdf
    • http://bagiez.com/userfiles/file/rexuxowamibowekogoxerogi.pdf
    • https://atavio.ru/files/file/52202999456.pdf
    • http://cerezolorente.com/files/cerezolorente/_repo/file/mibikubajuwi.pdf
    • http://eros-arena.com/eros/userfiles/file/ladofira.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210911_08222B2A7F56624D.pdf
    • http://greddy.com/admin/common/ckfinder/userfiles/File/papepumafedod.pdf
    • http://falerisztika.hu/tmp/30646990415.pdf
    • https://ahirealty.in/admin/userfiles/files/wesituxanuladenonol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf8.bin
c0ddcef9ddcbf201598fc52ee53db62a351fee21c6724f048fd1a5439f179a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 17192 bytes
font_01_sfnt_off00010958.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 16792 bytes
font_02_sfnt_off0001216f.bin
9dafa948dea07534350c16c668cf26c812b7537c6ce11394fd33958f5e356b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 10272 bytes

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