Malicious PDF — malware analysis report

Static analysis result for SHA-256 de43cd349b0290b2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 18:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a134e8c61c4953686d733abcf4016501 SHA-1: 49b3ca765e0298088683206378d10c388815fc65 SHA-256: de43cd349b0290b24ba177cc713bfe132ec92c20a4d94d45219a039df5bfd6df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely as part of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=android+strings+xml+to+csv+converter PDF link annotation
    • http://nbc.com.vn/ckfinder/userfiles/files/fuvixesomalisijum.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/15906308159.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/51526205232.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/57871237234.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/45033308167.pdfIn PDF document text
    • https://mihalex.by/files/files/pavefumaj.pdfIn PDF document text
    • http://slovoveri.org/userfiles/50310469691.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/53717225739.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/vifegemudu.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/79357762233.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/pelitubutafurif.pdfIn PDF document text
    • http://alvitraders.com/files/5144031665.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/4347824923.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/sakasawati.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/kizilutupokujosomikonen.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/54375086240.pdfIn PDF document text
    • https://harom.ro/files/file/48362374856.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/zowelejag.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/sobosimoxudes.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109161155292074.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xaginuleve.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/27257218349.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/94619703043.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_off0000cc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 10700 bytes
SHA-256: 4a50597c752fb56dd0c06f83772f29eccc79f3799a5b32740b31f0604eff33af
font_02_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 17444 bytes
SHA-256: 5f4caec05032072b19be5d3aa08ecf4c3aa5dad2194c5623eeaf14055904101f

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