Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5b25749a20faad…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 23:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 12e2a6d79ab7d640bc76e45adcee5047 SHA-1: 8fee0b5d406b7d7fa9bdbff4b87785f7d288afef SHA-256: bb5b25749a20faadd4a099a21e9ed728d89df22050db68fa9d674980cbbb2ce1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on various domains, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic of using many distinct, low-reputation domains to host links, a common phishing technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://watertorens.nl/userfiles/file/mugusatomibegobesoki.pdf In PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/zedubugajexuxerizatofim.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/bipawebesadoxanogamare.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/nonovoxus.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/kozevidisoxorovosapo.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/30897674334.pdfIn PDF document text
    • http://bptramptour.pl/files/file/taboxaxididemeka.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/46292004531.pdfIn PDF document text
    • http://vuason.vn/upload/files/kegusinapinefoz.pdfIn PDF document text
    • https://ms1oke.com/contents/files/rexiwobuvup.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/ratidabufeledo.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/rulezimirujivajodalubul.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/koxov.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/warevenowedivulitutawo.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/81089387783.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210904042556.pdfIn PDF document text
    • http://bluebossa.pl/files/file/25679991398.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/68271436231.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/40695654418.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/24061644994.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/121745133.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/88833364722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=play+store+version+downloadPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/38092565626.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_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 10508 bytes
SHA-256: 27d9fbe716e69f9113899b1fcddd48e733b620bc59cf5831c61dc1099e28588d
font_02_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 18356 bytes
SHA-256: f3fe562bb2d4220af486f35671c8bb7ae572cbe45e98b89b571bddc93a647f8a

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