Malicious PDF — malware analysis report

Static analysis result for SHA-256 1430b9298ecfd016…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 19:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db25c7ceba10e496af8aae389bbdbe32 SHA-1: 6ee4db0b3dcee70ac1ca5b7b4ed7d8a076c67196 SHA-256: 1430b9298ecfd0169ac5ac611543f30fb46ec9b570c052914273a081d70c346c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a phishing or link farm attack pattern. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a strategy of using disposable hosting for link distribution, likely to evade detection and spread malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/uplcv?utm_term=como+mejorar+el+sonido+de+mi+android PDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613238ce28325---77140749759.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/50121735293.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/61791152781.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/48907982496.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/12999927336.pdfIn PDF document text
    • http://sparkpro.lv/content/file/46347936685.pdfIn PDF document text
    • http://santehnika34.ru/images/file/77074124927.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/nasazerajawokazalegugeg.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/konizedizomixa.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/32450092379.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/54600824189.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/69389158372.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/18211291993.pdfIn PDF document text
    • http://okvin.org/userfiles/file/maradomiwokinemigux.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/43534376553.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/93952896198.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/77000566057.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/lumakuzazunaluk.pdfIn PDF document text
    • http://pmke.cz/pictures/files/76484313623.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_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 10472 bytes
SHA-256: bb4ae24f4ef76cdde308943c9e3b66d663576543204caef695903b62d285e773
font_01_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 18660 bytes
SHA-256: 1293a11315d176e21608c36bcb131a9f8d99c38434aeef899b8291aedee5b25f

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