Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73056b8b6c4f3de…

MALICIOUS

PDF

82.9 KB Created: 2020-11-10 17:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: adc31e3550a7ef350c09a7fd64b82148 SHA-1: 9969a0dc92dbc2d3f511f080b0ee8a6f877f8469 SHA-256: b73056b8b6c4f3dea36678b53fd09b2079383a2aaffa67bfc5f7eb3d84e1a309
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm with numerous external URLs, including one pointing to 'traffine.ru', suggesting a phishing or SEO manipulation attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffine.ru/123?keyword=minecraft+custom+enchants+wiki PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496193/normal_5faa73ce706fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f886e65d20fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_5fa40fcf9f0eb.pdfIn PDF document text
    • https://vamepuruzaf.weebly.com/uploads/1/3/4/3/134352512/tonivexuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juduk/zumevusogamatabija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b50cc1-d5c7-4250-a017-ee2930fee8f3/ross_edgley_the_worlds_fittest_book.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/clay_county_library_fort_gaines_ga.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/paleo_diet_book_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830a8b6b-7ca0-4708-bd69-145e23481124/beauti-tone_countertop_refinishing_kit_colors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee97398-8291-482c-93e5-b4466920aa64/building_spelling_skills_grade_3_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ff0adf-ee84-412d-8785-43611432ad74/gazejenorujofama.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F8 5872 bytes
SHA-256: 5e32b07bf5960e921575bb9a6f68e6e9f436959764fc02526684fbd6bdebe8d7
font_01_sfnt_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 5132 bytes
SHA-256: 887217ac69938fdb19a063514dc412fbabbb625da61978e244791fb71e89592a
font_02_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 13520 bytes
SHA-256: c48cfdc920e43e4cdf48c55b8dd619ab616203e263df9043b28e29cf8c2b0d8e
font_03_sfnt_off00011973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
font_04_sfnt_off00012e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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