Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa6891f489f9786…

MALICIOUS

PDF

87.8 KB Created: 2021-05-20 11:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 58642ba2a71d829cff7f5ef6e3b5b0f3 SHA-1: b5606fd2e47a4d6b2029d5a7735a3aa5ac982125 SHA-256: 6aa6891f489f9786f67e7d6c6325a840808df7f4dbdb52fdfbf7b4a478f83cc1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting an attempt to drive traffic to malicious or spam content. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary malicious URL identified is 'https://leonvi.ru/strik?utm_term=survivor+season+39+cast+pictures', which is likely part of a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=survivor+season+39+cast+pictures PDF link annotation
    • https://xudufuzed.weebly.com/uploads/1/3/0/8/130815664/4761965.pdfIn PDF document text
    • https://zodazapel.weebly.com/uploads/1/3/4/5/134511258/mivonirolaridinogux.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/xuzakob/what_careers_can_i_get_with_a_finance_degree.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/dunixigodemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d295f1-6419-433f-80a8-66e60895a05d/harry_potter_and_the_half_blood_prince_full_movie_online_dailymotion.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/17693708125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17e9cbc-e0e4-4f36-afaa-f61c98cb43cb/18253609495.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/sexosafopewakulosonaz.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/how_to_do_fourier_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f2ba4f-b934-4ccd-8335-51a92e4fc88e/85818204612.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/33732229808.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/cappuccino_video_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/86499812787.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/alka_seltzer_rocket_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b795a1-30dc-4ae1-ae71-5f6878e85fd5/epicurus_letter_to_menoeceus_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18924dde-eaf8-4568-ae6f-2d9e2f82d97a/pokavajukekawikobitulovif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e421d52-0779-4cef-8008-08dfbb24f284/reddit_wsb_lingo.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/the_entertainer_song_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88887c21-12ef-4d31-80ea-86d735df6a07/church_treasurer_report_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 5260 bytes
SHA-256: dae55a36f031357083ff37dfb42eb9d126e2694eead0b0faa8ce65ab2540cfff
font_01_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 14316 bytes
SHA-256: 9d55856cd2a72bb42e17d28b10495e12b74aaad7fe61f816bf8a5f8ce2ff1e42
font_02_sfnt_off0001424a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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