Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef05a89caf867698…

MALICIOUS

PDF

74.1 KB Created: 2021-09-14 09:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c98ff63f78a60b206437195e83c16c68 SHA-1: dee44affa2d9b926e8f720b853f92a46bff24167 SHA-256: ef05a89caf867698d030fdcb21c3ae306096a5ea230e85165eb0a0da8a07c7ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://irlanc.ru/uplcv?utm_term=stick+fight+offline PDF link annotation
    • https://jpjplumbingandheating.com/FCKeditor/file/goxasefozakezogatapef.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630954115860dd6718de5eaae697b.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/80459712506.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210906002418.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109090601075165.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/6519756211.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/63139524900.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/38166720293.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/93088426546.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a0bedbe20b00d1691f1fdffddad5757a/dedudibagaxu.pdfIn PDF document text
    • http://dogable.de/userfiles/file/biletegifekuzewaboduweba.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/sixovomidifisigameb.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/52639949650.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/bifinadofigaz.pdfIn PDF document text
    • https://redac.ch/upload/48872214434.pdfIn PDF document text
    • http://bdn10.cz/files/file/17118652284.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/gapojosulofoke.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/zexikalibejila.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/91408981609.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/23911735493.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/refejom.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_off0000b833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB833 10352 bytes
SHA-256: a95e552183ad49007f205f49e65c1cd217c9ba4c7cf111bf7531a468e74c2d83
font_01_sfnt_off0000cf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 19648 bytes
SHA-256: fdfc40e287e54436e78994da7eae8f3fea4e395aa78076cf78c5bd0745f56488

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