Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbdd7fdc0aa30b5…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 11:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b420a520f9e894fe0fb1881a188cea11 SHA-1: a23649e514d296207039a324be35faf398c04176 SHA-256: abbdd7fdc0aa30b5f0806ba4a6dc12a8d42f6a083e8b4313f08c5948a4117859
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a phishing or credential harvesting campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://deycaterers.com/ckfinder/userfiles/files/93485368908.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f70245d---54790882498.pdf
    • https://bibonatura.com/ckfinder/userfiles/files/xidirilalozukor.pdf
    • https://bawauang.com/contents/files/resevis.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/35333428323.pdf
    • https://bliznacite.com/files/53369478532.pdf
    • http://accronline.com/userfiles/file/bavigalugotedonujusulub.pdf
    • http://augustaelectricalwork.com/editorData/file/17311370332.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/boxisitekaz.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161395c9c30634---15321072632.pdf
    • https://krassimirtaskov.com/userfiles/files/bitavunajogejileg.pdf
    • http://doks-films.com/pcms/content/file/86994598650.pdf
    • http://plise.org/userfiles/file/dugegegetudazi.pdf
    • https://topconta.ro/userfiles/file/72403300138.pdf
    • http://jcpingie.be/public/files/wirisatawixarugogup.pdf
    • https://un7un9b3rl1pa7-99.com/contents/files/16196753212.pdf
    • http://immobilier-valence-agen.com/userfiles/file/88569862838.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/39910402804.pdf
    • http://bdnchem.com/upload/files/pawomadur.pdf
    • http://cissi.it/userfiles/files/vefubudamesapenuguki.pdf
    • http://abwfinlay.com/uploads/files/mofebotapujapekuxa.pdf
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/75261403324.pdf
    • https://excellencetogether.com/img/files/file/jirurakebamufasegejuf.pdf
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/41131937763.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/88363825322.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=change+the+ip+address+of+my+phone
    • 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_off0000c282.bin
f36e0d83a7158b3f882c5bc9f8cd5325203ea08bead1474847a8f2549708d602		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 16164 bytes
font_01_sfnt_off0000ebe3.bin
2290f9ba1f5ae09754998dc082d16a6abe7e81151c8ddaf99883647a10044ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 11044 bytes
font_02_sfnt_off00010546.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 16792 bytes

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