Malicious PDF — malware analysis report

Static analysis result for SHA-256 203110c96fe1e934…

MALICIOUS

PDF

79.7 KB Created: 2021-04-12 19:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5bc99dc3644dc7e30664170cd3a1a988 SHA-1: e93968eae9d903660b0835eac36013b518a8c8c4 SHA-256: 203110c96fe1e934ff76fdb329ab8f1c5fcbeea9587c857479e95cf16aee3cd5
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 point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=a+gentle+introduction+to+stata+pdf PDF link annotation
    • http://jumpfs.space/83370789706rbtnb.pdfIn PDF document text
    • https://cdn.sqhk.co/leloxoreje/IghFhfI/92680034554.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/jjEqX01/image_2_icon_converter_download.pdfIn PDF document text
    • http://storezone.info/20275463918yrx7e.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/jbCgdMj/93513114609.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdfIn PDF document text
    • https://natevotid.weebly.com/uploads/1/3/4/7/134773148/6731812.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/zigihcM/gafikuriluwarop.pdfIn PDF document text
    • https://netukilegulises.weebly.com/uploads/1/3/1/6/131606016/kewulokeg.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/aHCgBhi/hit_it_hard_baby_song_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/g1qjfkD/88214692215.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/1cf75b37bcec6.pdfIn PDF document text
    • https://cdn.sqhk.co/godidudawat/3hwKghi/crowder_funeral_home_pearland.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/luropiw/book_review_format_year_7.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/knights_of_st_john_international.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/98893128673.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/maplestory_2_maple_guide_ugc.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/how_to_add_pictures_on_top_of_other_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/letter_template_ai.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/ramugebavuxivuzopeduv.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/icebreaker_games_for_remote_meetings.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_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 5312 bytes
SHA-256: 7348669f7e97e84696b5748bf028cc38fdfe3c13ea12f434310733fa1f9df1bd
font_01_sfnt_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 10676 bytes
SHA-256: 1dcf6215c5a844e46b9d5790684923f93e9de03d274753204c9ddf2e076b22e2

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