Malicious PDF — malware analysis report

Static analysis result for SHA-256 0539101918f0332f…

MALICIOUS

PDF

74.2 KB Created: 2021-09-15 14:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c312732f963be09371512d29e177141 SHA-1: 7bd5587241896c92685dbfc9575f38dbbefd4982 SHA-256: 0539101918f0332feda4b35f4fbb74f80b4beb753e5e404b4d86a11bb2402499
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://technology-mp.it/userfiles/files/9310764364.pdf In PDF document text
    • https://gadesign52.com/uploads/files/202109091113202958.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/nalanewi.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/nizunomu.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/rapasowubalaka.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/bujapawikefolufozazuf.pdfIn PDF document text
    • http://888chji.com/userfiles/files/45543167946.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/21206642958.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/gipazeboresajigixem.pdfIn PDF document text
    • https://robodom.si/files_vsebine/23606031981.pdfIn PDF document text
    • http://umhouses.com/uploads/files/13826016329.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f86996671e---69375051235.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/47645247526.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/63891117184.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/47348600644.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/zugixapurovadida.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/14010766429.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109141133298086.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/43671985062.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/xoduwibazav.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139413356a7c---tumiwidokedubotibejiforod.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/42263391246.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/44651899103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=infinite+flight+free+pro+accountPDF link annotation
    • 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_off0000be3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3F 10640 bytes
SHA-256: d6400bc76d2a46ab048c45e3f8e9b3734f7af30591629232a9415ce720bd2098
font_01_sfnt_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 17396 bytes
SHA-256: f625bd3bc5b92a9bf5f8ef3ea88595247a5cbffd31139ba04aa5b04eabc84fac
font_02_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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