Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ba652bf70f8066…

MALICIOUS

PDF

74.5 KB Created: 2021-02-16 07:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 67993a4da5288b731c1fb2a2204b9a08 SHA-1: 0d3976e5fa3d1cae29ea3d2bc01f4b340c71dd35 SHA-256: b7ba652bf70f80664dd0f3008e8f4476c1c4052e1b22b47b9116e091ab1b3e80
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 'yafferge.ru'. This URL is presented in the document body, suggesting a phishing or scam attempt to trick the user into visiting a malicious site. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?utm_term=insinkerator+badger+5+troubleshooting In PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5fe098d67a39e.pdfIn PDF document text
    • http://subbellassecret.com/hd_black_wallpapers_1080p_for_android_mobilekkaww.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxujakosepa/fOghid1/95278327913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390052/normal_601835ae6f6ee.pdfIn PDF document text
    • http://naturwows.space/tas_rendez_vous_sous_ltoilesjezx.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/591bab48c7eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497650/normal_5fff6d51141d3.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/bhjgeD9/xalagujoviviwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383680/normal_5ff265a15abd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479454/normal_5fe66ad343ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_6028ec2f36081.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/7531032.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/zheNXOp/woodworking_bench_adjustable_height.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391602/normal_5ff9da720ad77.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/desenaz/esl_worksheets_present_simple_vs_present_continuous.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/inverse_hyperbolic_functions_worksheet.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_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 5352 bytes
SHA-256: bbbbf2a777cb5548c7f2540f43725c38de7b58a79727f304d1ccd3093746c49a
font_01_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 10956 bytes
SHA-256: 91a03eaef3dbd39cde319187e4bb42a529a4838386f7e91ea0ca2b01bfd4b225