Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33ffe5b6f58258d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 12:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 40deebe88faea794297b90516506040f SHA-1: f1bbfedcbb8db6bdb408989172ca7ba7d3a9224c SHA-256: e33ffe5b6f58258d753c166e1291e41d2f7fe3b00297a531070ea37e6efa3569
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URIs pointing to external websites, including one that uses a raw IP address, suggesting it functions as a link farm to distribute further malicious content or phish for information. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=android+jelly+bean+news PDF link annotation
    • http://houselandia.ru/files/56360607682.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc28a7233---95664255581.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/gesokagodezebegamomotuwi.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/gegogofuvananax.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/vibeserapov.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/vipomexufuxizurefumav.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/mitisaxuw.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613931b0b5d27---fesuw.pdfPDF link annotation
    • http://agrocare.hu/ckfinder/userfiles/files/11229683455.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/26614566389.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/26528518137.pdfIn PDF document text
    • https://ottopianos.nl/files/diredoxenujotuga.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/xamitinid.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/dujonorinomigonil.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/28669138716.pdfIn PDF document text
    • https://betsin.org/userfiles/files/kobozarusanaverotuwel.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5ad749d4---37976742651.pdfIn PDF document text
    • https://theipbuzz.com/images/file/tafiwitupaxejiveresanidi.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/molopi.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/wajorikajapubel.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/dajazulitibal.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/27808429114.pdfIn PDF document text
    • http://mextro.de/upload/files/2915150636.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_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 10596 bytes
SHA-256: d1f65770c099e2ff16f85bd76842a2ea7610078db367084baa0977f83fcef425
font_02_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 18664 bytes
SHA-256: 51b4bdf088efed4e87f975068dbb86b2a6a8f06338778e80d0f5972fe1d41b81