Malicious PDF — malware analysis report

Static analysis result for SHA-256 18399f6f4e807382…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 02:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7470a8ddeeba01e5764d308186f5c009 SHA-1: 52380c79d1a55507cd2ba759bab3e594966761fb SHA-256: 18399f6f4e807382a495b206d1db307a5bb27a7779ee0ed5d740d7642a76428a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous distinct hosts, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://manu-transport.com/documents/file/89474083852.pdf In PDF document text
    • http://speckrepeg.by/UserFiles/files/31156346246.pdfIn PDF document text
    • https://spacio.hk/attachment/file/72557258772.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/demufamavolemiruxuxagurum.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/94777327991.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/mikitofiw.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/18420214569.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/40476857320.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/lepoluko.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/sigetowunotepul.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/58556213382.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/55598854743.pdfIn PDF document text
    • https://fuoriscena.eu/file/36554495496.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/53202909054.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf94cee38c---fufivopufugogitosawujulem.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/55963163375.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/77526498065.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0378b871---10571632464.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/mekamixige.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/57957823206.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/1056336445.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/54129267490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=stik+ps+untuk+android+tanpa+rootPDF 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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 10476 bytes
SHA-256: f16c757a4fb38c44b362a58a96fa01b434f3ded570c51596ae1fe72cd06b8b72
font_01_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 16912 bytes
SHA-256: b1e544e66dc85aec3dce0bb68a48ce10bf2b583dbca07aec264473003d9a8d61

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