Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0281ff84e7c64c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 16:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c06edc41e791256dc8ac4ee3c4aa32f2 SHA-1: 880a0d5ca59a9406e6a61d5ccda2bb2f8a946475 SHA-256: dc0281ff84e7c64c16779a1b3a177a10aa2844ebccf2c152fb1e154456d43975
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. The PDF contains numerous external URIs pointing to a link farm hosted on disposable domains, suggesting a tactic to obscure the ultimate destination. The presence of 'fakeld+apk+download' in one URL suggests a lure for fake application downloads, a common phishing technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=fakeld+apk+download PDF link annotation
    • http://montex.pro/uploads/userfiles/file/mokejogijalo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd26580e0---32449809694.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/jemibuwipefatigawabusixin.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/68024859302.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/rijuzizapovuribodu.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/63745294148.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/4986971024.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/71476236793.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/63574435047.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f86a872db3---24078593709.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/woxogamujipefu.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/6407990724.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/buzivo.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/kinezurad.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/79803106812.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/tiwufugina.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/93515303206.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/49729128753.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/bedonitexutawuzip.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/74090253286.pdfIn PDF document text
    • https://businesslife.com/content/file/38721087607.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/59836007779.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/xutixuze.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/63196127980.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/42416659876.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_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 17964 bytes
SHA-256: 3663445b9ad9c07cc93a686b3777b378c8b7c672c8f7ec27e4fe638932f549d4
font_01_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 10084 bytes
SHA-256: f9ba4883c68265e4ac68dec44539bf33d010a1e6cfe334aac32d2cd7f1410c96
font_02_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1