Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a50dab9067300f5…

MALICIOUS

PDF

71.0 KB Created: 2021-02-07 09:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c63d40ba21c3715ce797097a182b5355 SHA-1: 7efa708cd6cfd10bb25a83f25265f3cf30665e4b SHA-256: 8a50dab9067300f55fbc3ded15e6f68e9f4d3b611b1d3429b5ce763707e030c1
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/aws?utm_term=bu+bhopal+exam+form+last+date+2018'. This URL is identified as a known malicious redirector. The ML classifier also flagged this PDF with a high probability of being malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure users to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/aws?utm_term=bu+bhopal+exam+form+last+date+2018 In PDF document text
    • http://videohost.space/kizarazoj6qibe.pdfIn PDF document text
    • http://soul-felt.com/51445171753vu9m7.pdfIn PDF document text
    • http://autoport76.online/prot_warrior_leveling_guide_vanilla1tegv.pdfIn PDF document text
    • http://silvanozito.online/92156129812uffso.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/lurutopobi/a_league_live_tv_guide.pdfIn PDF document text
    • http://ketoxuxun.epizy.com/maporofutu.pdfIn PDF document text
    • http://jiporiri.rf.gd/39893549185.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/57310591264.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/68341231680.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/ayn_rand_anthem.pdfIn PDF document text
    • http://kovoxajinuf.epizy.com/lepidoptera_characteristics.pdfIn PDF document text
    • http://nazifaba.rf.gd/winforms_datagridview_datasource.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/febowufotefepupizevuxiluk.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/nedenisowutiwomagez.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/kavuwimasepofisogex.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/clubbers_guide_to_ibiza_2002_tracklist.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_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 6056 bytes
SHA-256: e6d45d8147dd78eb4a2a1c90cdfec6d0733df919cf8782433f8c6629437f6949
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 10656 bytes
SHA-256: 4f61cf44d1a31a2e1093f6c666f1ed361163dad4c645042dbaa825ffb6382c14

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