Malicious PDF — malware analysis report

Static analysis result for SHA-256 540e4d8d2c3bbd83…

MALICIOUS

PDF

88.1 KB Created: 2021-09-23 19:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe844bac50c07a9f6cfa2577dbadface SHA-1: 5dc91f7082315908abb22f01b5c47ffc10755ae2 SHA-256: 540e4d8d2c3bbd83a984b778dfd9a1ecb7b233051eeec71d4a66943deb9433d4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. The document body is heavily obfuscated, but heuristic analysis indicates it contains lottery, prize, or parcel delivery language, typical of phishing lures. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest potential for malicious JavaScript execution or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://fujieshubao.com/zk/UploadFile/file/2021091210312073499.pdf
    • http://seattlebestteriyaki.com/uploads/files/93880674405.pdf
    • https://sieuthigo.vn/upload/ck/files/dogito.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/19721965312.pdf
    • http://inarchengineering.it/userfiles/files/manejolovotawigiwesusabi.pdf
    • http://61kidsclub.com/userfiles/file/jogidomumumubabuton.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/22231249808.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/0c3a1b7cb663b8ee56055cf7047fac45/lumuxivowoxiguzixet.pdf
    • http://15441707.com/data/board/file/20210905034355.pdf
    • https://buyafranchise.org/files/files/xuwakefexo.pdf
    • http://fapannimario.it/userfiles/files/fumupas.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/34423036208.pdf
    • https://qian-ho.com/upfiles/editor/files/nulabujemejuvubawivafi.pdf
    • http://fotostudiovaccari.it/userfiles/files/6868982389.pdf
    • http://www.astmalek.cz/obrazky/file/40379938547.pdf
    • http://elma-itc.ru/!upload/files/17125778008.pdf
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/pigatuxaridube.pdf
    • http://rudolphalexander.com/uploads/files/jovotisenokiviposab.pdf
    • http://xn--299a941ap1h.com/userfiles/file/20210921195310.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210909_190313.pdf
    • http://rideco.hu/upload/file/pumibi.pdf
    • http://knupress.com/pds/editor/file/95014169876.pdf
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/gegupuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=stop+android+phone+from+listening
    • 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_off0000efc5.bin
944baad6fda0f0f051d3a3af7f7ec42211cc5ac8f0087edc1de2dfb030f11bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 18828 bytes
font_01_sfnt_off000120f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 16792 bytes
font_02_sfnt_off0001390f.bin
fa5afae3f3351b671d2ef8a2a833e344c22bf6a97c33fefa9f1c3c21ca72fb95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1390F 11020 bytes

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