Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cf673e83d65054…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 19:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ce27373c281f19e715da442b76a5ea8 SHA-1: 98d54729ced61da8adef81e1789493bce186d965 SHA-256: 93cf673e83d65054bef149402a45cc7527f9e82b911ec062ca05cb2405719f1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which are hosted on disposable domains or are part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=i+feel+so+dizzy PDF link annotation
    • https://apartmani-mestrovic-krk.hr/files/94410543583.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/fogazofim.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307703a1bd7---7864576576.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/tozizazatarek.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/javomatirepeviwil.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/11437469719.pdfIn PDF document text
    • http://a-pluset.com/userfiles/61937360857.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/junikixoxes.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/zekogonowu.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/41617016456.pdfIn PDF document text
    • https://kultmotor.hu/images/files/85565853638.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/tegunujediwegixivopefim.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/sopivugonobuwinebewetube.pdfIn PDF document text
    • http://specialcats.nl/media/files/72444017286.pdfIn PDF document text
    • http://maksimetall.ru/files/88018726789.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/denibinujexuravefixesi.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/xipevuwa.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/15825657120.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/milisir.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/rufojixaladixenoke.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/1006973750.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_off0000c5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 10008 bytes
SHA-256: 5aef131a66379221ca0a3864725ab5316a147b3b40234c5b87002c7e7711f8b9
font_02_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 16548 bytes
SHA-256: 5434ca5c9561ca75a1304738cd0117adcb1497a7c14ffd483336db8bf169c10a

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