Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81836aa91cfe52e…

MALICIOUS

PDF

79.8 KB Created: 2021-05-20 11:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a9e84ed4e9c2c71da9ffea6e0da29573 SHA-1: 2d2c7b8b55612deb3424b84d2a708df5cd5c6e29 SHA-256: b81836aa91cfe52e80ec4d87e1f8d25bdd43f9285e5a00ac0fa5b495844fff51
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vilenefex.ru/strik?utm_term=how+to+screen+mirror+ipad+to+sharp+smart+tv PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387037/normal_5ff34556a7c19.pdfIn PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/gusuzor-gubevetirexirik-kobimok.pdfIn PDF document text
    • https://binimejo.weebly.com/uploads/1/3/4/6/134665204/79478b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_605f7e056e869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_60185d6d9f237.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/80430072.pdfIn PDF document text
    • https://wedegamev.weebly.com/uploads/1/3/4/3/134305253/d4c64937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_5fd1d73189527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389823/normal_5fce62bf33593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_60419d6ed657d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476294/normal_605fb5dd3b9aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_604625d932d42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5fc67232eb19e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba702f3-c890-495f-9d32-1cb28cec0e8c/how_to_reprogram_harbor_breeze_remote_a25-tx013.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/barrister_parvateesam_telugu_novel_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/2008_dodge_avenger_rt_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536b1739-08ca-4820-9225-2b7d1050a126/wuduporoxotopizukuwakini.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/tales_of_a_fourth_grade_nothing_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad88799-0df6-467c-8666-01780d21e0c3/xerur.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/el_proceso_de_investigacion_en_arqueologia.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/area_of_squares_and_rectangles_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/53229115705.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/how_heavy_is_a_55_inch_samsung_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/the_sense_of_an_ending_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5cc8cf-a69d-42e3-9802-2bb57bb82b17/divine_comedy_drive.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/indian_alphabet_song_download.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_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 5396 bytes
SHA-256: 58e4f96cc8ab4875ef8c9c9b98fd4109a7f856697e87154368af1c2646c627e9
font_01_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 10980 bytes
SHA-256: 8ff3c2546bde99954cea3e8be3d00571243b119f2d19cb8c4d3114b6d993027e

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