Malicious PDF — malware analysis report

Static analysis result for SHA-256 7845f6ff7c39117c…

MALICIOUS

PDF

77.6 KB Created: 2021-08-13 15:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 969dfc50e5a4059a4da5c60cd66bb153 SHA-1: 2910c5cf42bbb68b7208ae27eedd3fdbee64448c SHA-256: 7845f6ff7c39117c2ea9daf99b3c2d6b58024923db870e6b118bff77667c84a3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing campaign. The ML classifier also indicated a high probability of maliciousness. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6474

Heuristics 4

  • 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
  • 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://joebalogh.ro/imagini_ws/lupibubufafabikelu.pdf In PDF document text
    • http://capmar.eu/userfiles/file/92849574305.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/57856808042.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/55801471241.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/mafakuv.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/sabaxakekasesebomideneki.pdfIn PDF document text
    • http://yuli-china.ru/d/files/tonegelo.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/8307502983.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/59638322392.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8b2a5722001977dabc93209359bac3a5/993874302.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/17467633541.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/xifelorutupub.pdfIn PDF document text
    • http://flexa.cz/docs/file/15958404224.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/83735458032.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/11874819404.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/5kspolcqc1bin8gcjhllnt8np8/purudemejes.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zifadebotuvuraf.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tufepubebok.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/15294824019.pdfIn PDF document text
    • http://skupka54.ru/upload/m/bidawotelawaj.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/98529213046.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/76737270493.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/33742530359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=%D0%BF%D0%BE%D0%B7%D0%B4%D1%80%D0%B0%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D0%B5+%D1%81+%D0%B4%D0%BD%D0%B5%D0%BC+%D1%80%D0%BE%D0%B6%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F+%D0%B4%D0%BB%D1%8F+%D0%B2%D0%B0%D0%B9%D0%B1%D0%B5%D1%80%D0%B0+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8CPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_01_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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