Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f1773450ad7084…

MALICIOUS

PDF

69.6 KB Created: 2021-01-23 22:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cb0b4e8e4ece9dc38c80cc938cef41a6 SHA-1: b5b1dddaa1a4ecca2894a311049d331b2b0deedb SHA-256: 70f1773450ad70843ad6becc4c8a997daf582695173423de4b7dc1b636a081e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, such as 'https://trafffe.ru/123?utm_term=paris+-+when+it+sizzles', are likely used to redirect users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://trafffe.ru/123?utm_term=paris+-+when+it+sizzles PDF link annotation
    • http://nokutanebufevon.iblogger.org/vovefozopidemuloginav.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/2c555dc6.pdfIn PDF document text
    • https://site-1210468.mozfiles.com/files/1210468/73875696928.pdfIn PDF document text
    • https://site-1178541.mozfiles.com/files/1178541/printable_alphabet_chart_without_pictures.pdfIn PDF document text
    • https://site-1176476.mozfiles.com/files/1176476/adventure_escape_mysteries_trapmaker_3_chapter_8.pdfIn PDF document text
    • https://site-1177258.mozfiles.com/files/1177258/jovuxonusepejum.pdfIn PDF document text
    • http://vuxokiwi.22web.org/81050478761.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/tetofamuxulil/c_form_check_haryana.pdfIn PDF document text
    • http://mevumum.epizy.com/retaje.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/following_directions_coloring_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/23429191009.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/nys_pistol_permit_renewal_form.pdfIn PDF document text
    • http://tuxijug.rf.gd/request_copy_of_police_report_lapd.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/91569498420.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/medical_books_online_free_format.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 4948 bytes
SHA-256: ec720151db66dff1153a23e6e1b321d9548d01ac1269e975337d3eef6829eb53
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 11424 bytes
SHA-256: 6087aeae6b75c20a21ca0185becaedbc5bbc0f53ff314cdd8917056a58898224

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