Malicious PDF — malware analysis report

Static analysis result for SHA-256 438856bd3fbdf9f3…

MALICIOUS

PDF

62.4 KB Created: 2021-02-17 00:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c8f2c2a49de2ad6d2fd7579b2923112b SHA-1: 334b8093d24013ce9246bdf1804c25a0ef22e592 SHA-256: 438856bd3fbdf9f35e6018bea1be8ab09eec594d97f3cf7488fd767531f59bc1
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL that redirects to 'https://yafferge.ru/strik?utm_term=singer+stylist+513+repair+manual', which is identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'Singer stylist 513 repair manual', likely to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=singer+stylist+513+repair+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_5fecb756ac9a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417329/normal_5fcf4869ab8f2.pdfIn PDF document text
    • http://freshremont.com/acquittance_register_format_samplehcd78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_6020c1e951598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5fd155a273334.pdfIn PDF document text
    • http://trikolor.site/16gb_android_tablet_deals7l8xh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528780/normal_5fff14c86463b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_5ff8d57cec6bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448549/normal_5ffdac3498c59.pdfIn PDF document text
    • http://ygrash.website/break_even_analysis_template_for_restaurantql93r.pdfIn PDF document text
    • http://pochta-24.cc/319345812008x046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5ff0b1a68660b.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/gebukil/nufuj.pdfIn PDF document text
    • http://saranexujeg.epizy.com/puzoripaxobevitiborewo.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_off0000b621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB621 5684 bytes
SHA-256: ed724d87b3335a6dbd87a3db32979e9d55ede52be33e93573f63450d0149450d
font_01_sfnt_off0000c979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 10220 bytes
SHA-256: 937f8de85b0f0c3fea3c7165b1a1720e4f2f39224bad906ea9e4ecae33c49e55

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