Malicious PDF — malware analysis report

Static analysis result for SHA-256 77db46153c746fdb…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 14:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5735db495f7158f6502a94cd462b7853 SHA-1: 945b0cc159ea6fbb40a8d809daa9a99777aaf9c0 SHA-256: 77db46153c746fdb48ea4262a83881b6020a64dfbb9c170060ba9de78fcf1b1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to malicious content, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://sambelteri.com/contents/files/98457873387.pdf In PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/81127046548.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/34420519072.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/tepuzano.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c973f0ac72---wikusekofizosofebogumalim.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/medumunuganugenapefid.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/jepesuloz.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210620095106_4h4wdu.pdfIn PDF document text
    • https://o-dance.com/upload/files/33743478935.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/11790042106.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/96336239345.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/rasikinudoxib.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54b344de0---digemo.pdfIn PDF document text
    • http://hanifeugur.com/image/files/75330028435.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/52994303564.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/92087064139.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/85804287292.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/43408037432.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/59528209324.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/sunagoguzix.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/81039677237.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/13749322750.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/zasaboludixudivipopiruga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=risk+management+pdf+forexPDF 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_off0000b748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5F 11036 bytes
SHA-256: e51a722474c775f19e7336b170f9c5a78d3424a3d303220c4dc1f20a5311b089
font_02_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 16988 bytes
SHA-256: ac8b6190bf90e9b6f171486db79cf099a9411b61801438e3f072057d18dd95eb

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