Malicious PDF — malware analysis report

Static analysis result for SHA-256 059df38b9868d5ee…

MALICIOUS

PDF

75.1 KB Created: 2021-09-15 11:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b6de7939821e5c31d7121c904bcc758 SHA-1: a7b1dec924447ae5cc145e6b12862121aa847e6d SHA-256: 059df38b9868d5ee199559727713e440524c0701f0f1669c7823cb35e334f5e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs, suggesting it functions as a link farm or a lure to external malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=the+anatomy+of+human+destructiveness+pdf PDF link annotation
    • http://dreiseengrundschule.de/files/74172528908.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/xirelorademabosogomokajo.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/binokamor.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/walokate.pdfIn PDF document text
    • http://rrarental.org/upload/file/99759649739.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be15f2c523---kakas.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/labizubusasukiti.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/memevawisewuwede.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/xazasa.pdfIn PDF document text
    • http://bluebossa.pl/files/file/25679991398.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/pubeleligusijivasamam.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/tazexadanepul.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/38118494910.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161302aaec70ea---zotuminebamavinezu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/53678128880.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/73781468963.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/rejuwu.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/10671579776.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/xizotib.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/bowofodidiralexiwenafiv.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_off0000c1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F4 11084 bytes
SHA-256: 9a554c4fadeca3a75a4eb13e595e3ff671bd7949267700c752e289b0fee99e92
font_01_sfnt_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 16636 bytes
SHA-256: 64ad48680faedad7ba60b5f0e53e2134f0f98b27645807aefaf8289b63fe5282
font_02_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.