Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4f7b72d1915872…

MALICIOUS

PDF

71.8 KB Created: 2021-02-12 16:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5fd630ba6530734240bcfb4c9f2579f1 SHA-1: bf628a1a43b312cda059824f8c5fe9cc325d274c SHA-256: cc4f7b72d1915872cee351281d74a29fccf7a6e264fa8dd6e8711e5f3a8adc6a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, which is associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded malicious URL suggest it is designed to redirect users to a harmful site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=eddie+bauer+men%2527s+guide+pro+pants+review In PDF document text
    • https://static.s123-cdn-static.com/uploads/4405907/normal_6000b7cb9f116.pdfIn PDF document text
    • https://cdn.sqhk.co/nojumuku/xRgdDjb/rugby_league_finals_2020_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5fffa4144402d.pdfIn PDF document text
    • http://bilapak.66ghz.com/bupirafeboterarivo.pdfIn PDF document text
    • https://cdn.sqhk.co/xobupiba/chhufUY/paintball_speedball_bunker_names.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/4Z4jjjb/jofud.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/zhi6zid/word_trip_level_497.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bilunijo.epizy.com/ziriremomo.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/90606180496.pdfIn PDF document text
    • http://tofekerotireg.rf.gd/75850986486.pdfIn PDF document text
    • http://kesotufujurox.rf.gd/wiwobenifinubikatibasabu.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_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 5528 bytes
SHA-256: a0040aae16b465d25046dac1dde1fb12568deaff31c00efecf345f80ac57512f
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 10764 bytes
SHA-256: 51f7a31195fb21f4316a326b2be4052abae5818a7be665b3c9fd7e96b0802a50

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