Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eee58edb0d35f1a…

MALICIOUS

PDF

81.5 KB Created: 2021-01-16 16:20:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fd0624046328afccfa8d3350af1025a0 SHA-1: debe5da5e6d2b8c7602e51ebc51dd15292ee32d3 SHA-256: 2eee58edb0d35f1a175333b0c9171185f1e830b0cfd516b2009df4c97d2ad4af
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing numerous external links, identified as a potential link farm for SEO manipulation or phishing. One prominent URL, 'https://trafftec.ru/aws?utm_term=sample+ielts+listening+test+with+answers', is directly referenced. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'CLAMAV_DETECTION' confirms it is recognized as malicious. The presence of embedded URLs and the ML classification further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/aws?utm_term=sample+ielts+listening+test+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372983/normal_5f966d2509271.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/KTEhiih/wipeout_3d_ps3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380380/normal_6001ebb115830.pdfIn PDF document text
    • https://pozegitewo.weebly.com/uploads/1/3/4/7/134758724/9435723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_5fb2efd21a089.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/LWMFidF/sagewiwuvusuref.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/pusolefosex/how_to_animals_eat_their_food.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/attracting_and_retaining_talented_employees.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/excel_calendar_template_2019_2020_editable.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/billi_billi_akh_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/popawep.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/vofupupaxojevokejakarodix.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/beamng_drive_free_0._14.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/nikitokutodixiz.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/sekamodiv.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_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 5428 bytes
SHA-256: 900933a3b8c02deb3a4465b078c7f4caad2848f3d93e6131a36ef47fc5a79ba9
font_01_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 10900 bytes
SHA-256: 17f6270a806b3d235e11211bb017037b6c552c357f7bb0922cffdcf270f22e66

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