Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc4885b7e3f9e24…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 19:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 671c1683edbde055a1056b7f35ff6741 SHA-1: 76f2307930bc25dc38c432fc55f7ee2b14496eec SHA-256: adc4885b7e3f9e244cfef615b49b79b1945ecd06cf1672c1e644f32b18b72432
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to various domains, characteristic of a link farm, likely intended to obscure the final destination and evade detection. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://gelblighting.com/userfiles/files/piruziwugenuwus.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613966b76c49a---21044764263.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/93129167690.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109161806362747.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e453ca72cf0accb30501f585c161c2ca/96249281719.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/wefasewosemuwif.pdfIn PDF document text
    • http://vhshf.de/File/vifibovesemume.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/tuzisifel.pdfIn PDF document text
    • http://taigesw.com/upload/files/voluwoluze.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/bizogifinure.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/62226540623.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/jiwew.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/galep.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109230453465046.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/54260209040.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/bopawasuseresomor.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/41882900117.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/98957097035.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/77278681112.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/59618338041.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/tefadukaf.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109072204297269.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/49131302047.pdfIn PDF document text
    • https://avenue102.com/uploads/file/damexadiz.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/38524167559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+video+tutorials+for+beginnersPDF link annotation
    • 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_off0000afdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDB 10816 bytes
SHA-256: e56ab0f2e7146db5b6d95f1573304cab0f192839591cd389d42fafb3b0950544
font_01_sfnt_off0000c8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 16372 bytes
SHA-256: 08684923637a764f3e62ece8b03a0d8afe285cf5bd25d782b6d8a7279505a9b0

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