Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab47baf2d0a7bbd9…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 00:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 21f8d9e9d76395c90d514a04b70ac1ca SHA-1: 386d9dbbb370d09f531542d7f308a047e25bbde4 SHA-256: ab47baf2d0a7bbd9a23ef23fa093ab982c125712fbe2e372d0ef06a4828fee6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=flat+belly+overnight+free+pdf PDF link annotation
    • http://anhbanglaw.com/userfiles/file/menoj.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/tufodajipomexuziwa.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/82589635436.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/favuperemegesiboromat.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/masijojipezivulaturetawi.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/wazefigejifi.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/18438783259.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/36785185328.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/22226381732.pdfIn PDF document text
    • http://origo.ws/userfiles/file/16166366384.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/mezowunatenozuvez.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/kuxitepobevafin.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/39337914225.pdfIn PDF document text
    • http://mamitobe.ru/files/file/bokunimofotewi.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/titafidopi.pdfIn PDF document text
    • http://xtra360.net/campannas/file/17965813315.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/88522277707.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/nixitaxisovusuz.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210917221017.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/63276725428.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_off0000ad2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2A 10904 bytes
SHA-256: 5e4d73185fef252efd33cd1d1e0628f12dcf695b8b327e27cd5d16653f179217
font_01_sfnt_off0000c5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 15324 bytes
SHA-256: 2eb89af761cd4585cd45b8c8fb5f4734ac703d4db523bca6e294ea24e2c2edbb

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