Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f679e684b51d564…

MALICIOUS

PDF

84.2 KB Created: 2021-05-22 21:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 588e786d1d11568d8ab63a3ebe26419f SHA-1: b2cefc805292a8aa1f185db4e1797758a612c54b SHA-256: 3f679e684b51d564665e58d1653369b7d1615e56e196ba70ab0cb41c6c3d51f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a site for malware distribution or credential harvesting. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/strik?utm_term=bloon+tower+defense+5+hacked+unblocked+games+66 PDF link annotation
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/3762906.pdfIn PDF document text
    • https://zogoporev.weebly.com/uploads/1/3/1/3/131381602/627e97aa0f6455.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/rekopilunatemo_fapis_vonurasezaj_loletamexeru.pdfIn PDF document text
    • https://pavuxutekukos.weebly.com/uploads/1/3/4/7/134704216/tiwasovusivezab_vebuvaja_jalepate_lomidejonekip.pdfIn PDF document text
    • https://jenamojid.weebly.com/uploads/1/3/1/0/131070605/fotujigo.pdfIn PDF document text
    • https://tujuwofaxeg.weebly.com/uploads/1/3/2/8/132814826/167870.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/128326a0e06bf.pdfIn PDF document text
    • https://vinixojaz.weebly.com/uploads/1/3/5/3/135312356/pikogeboji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xesigeze/35096246183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb202e20-c3cb-4ff6-8864-01b9f878e015/maytag_bravos_xl_washer_turns_on_by_itself.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/wagepufenaro.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/rikogilawepod.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/248234290.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/14645834064.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/simple_html5_css_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72bde456-7877-4f11-988d-87d28ed1ce43/84262312599.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/jipavazudofakekuxaxumajus.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://scripts.sil.org/OFLIn 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_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 6056 bytes
SHA-256: d0a90d66d938e502e14f2ec60aeb2fdf7abdf6bf711eb9fb81193518ab8fe95c
font_01_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 10500 bytes
SHA-256: 43f9f12f905fe0032ae81f033a557d852ce08207962bde1aa3b01557997918c2
font_02_sfnt_off00012cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB1 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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