Malicious PDF — malware analysis report

Static analysis result for SHA-256 797202a51cd30ae7…

MALICIOUS

PDF

77.0 KB Created: 2021-02-11 04:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 13f493e20c79205437ce2d426028c095 SHA-1: 2f5bcb42e7a381fb657df405e22f234621dc376d SHA-256: 797202a51cd30ae72b462d9cefe371cbcbb283acd0e16b5f4080b3544001bcbc
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=making+common+sense+common+practice+pdf In PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/4a54a8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443802/normal_5ff9c52bc5da9.pdfIn PDF document text
    • http://importants.space/equation_of_a_line_examples_and_answers4bsfw.pdfIn PDF document text
    • https://fefajuvojamunuj.weebly.com/uploads/1/3/4/7/134750085/59a2c48.pdfIn PDF document text
    • https://cdn.sqhk.co/niduzabunu/ihagfhj/parkour_race_mod_apk_happymod.pdfIn PDF document text
    • http://alkim.xyz/ballers_season_4_episode_1a4waj.pdfIn PDF document text
    • http://blancop.xyz/50413163077hoeb8.pdfIn PDF document text
    • https://waxevinibiwe.weebly.com/uploads/1/3/0/9/130969944/rejukowawenujekeli.pdfIn PDF document text
    • https://tizelilof.weebly.com/uploads/1/3/5/3/135311218/7621691.pdfIn PDF document text
    • http://hookup153.space/bosudawozadijzooxl.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/saziwijaxodav/beeruva_video_songs_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/blue_eyes_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/20422864443.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/18767894925.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/shareholder_loan_agreement_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/katakana_writing_sheet.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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 5300 bytes
SHA-256: 183a56d3e27bee6306f4c1d550c25ba51edddb0c3d0e73be7b1866a66ff79483
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 10524 bytes
SHA-256: a0593b2151cbfed33f8494a5e08b0b5ac9bf4258cf7199011ccf108855975449
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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