Malicious PDF — malware analysis report

Static analysis result for SHA-256 6283fee4e971cf38…

MALICIOUS

PDF

126.6 KB Created: 2020-12-30 00:49:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 59b2d8728bff387c956806e5cc691469 SHA-1: 27d4eeae55b5fa754137bb398b477b8f37d6f73b SHA-256: 6283fee4e971cf38aa127c20760393a0848572f0737ba98648b8d2dccb51712d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://traffine.ru/123?utm_term=branson+screw+it+let%2527s+do+it+pdf', is directly associated with the document's apparent theme. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://traffine.ru/123?utm_term=branson+screw+it+let%2527s+do+it+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445125/normal_5fe87b13b5295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f8e3fe05295d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f917599bbf7a.pdfIn PDF document text
    • https://kegilosibumu.weebly.com/uploads/1/3/4/5/134513635/xoxedinizelika_liwuvusewe_nazumudu.pdfIn PDF document text
    • https://lefexaro.weebly.com/uploads/1/3/5/3/135324439/2354a022838e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476268/normal_5fbf073f2033d.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/wisuw/nelopobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91eb6f3a-42a3-4eb7-a23d-7d0fb4ed801e/how_to_make_thermal_night_vision_goggles.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/pdf_to_autocad_drawing_conversion_online.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/clarinet_sheet_music_gospel_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023ca105-080c-4790-afa8-e8af1b00e789/56785122285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a3af4a-3299-4f39-ab02-c51a0d97b6d4/91894435402.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/29118831492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232e8b2c-7a09-4da3-804e-061102051e16/anatomy_and_physiology_reproductive_system_worksheet_key.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_off0001b0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0BA 5324 bytes
SHA-256: 7b71017e69f6023ca909415528e4f390ec67aff8f1e515e00b76be5494ba3c8a
font_01_sfnt_off0001c2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2FF 12832 bytes
SHA-256: a0b4513a8acc5c01a70adc9ba0e7136d92d2693de45db09d55e515692f3ee76c

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