Malicious PDF — malware analysis report

Static analysis result for SHA-256 b611c6e01f3144f8…

MALICIOUS

PDF

73.0 KB Created: 2021-02-19 00:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0309023ef90f19d3df67ff08497c38f8 SHA-1: f761a0620c9181f4a0b8cb1c1b676e8a0c374145 SHA-256: b611c6e01f3144f8b8ad50cfe6905b57121e5562c377ad0aabd9c27809ac9a95
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/strik?utm_term=is+catch+me+if+you+can+on+hulu'. This URL is likely part of a phishing or malware distribution scheme. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the redirector suggest an attempt to lead the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=is+catch+me+if+you+can+on+hulu In PDF document text
    • http://ketosimple.online/java_8_for_androidrjshl.pdfIn PDF document text
    • http://winoraama.space/stem_and_leaf_plot_answer_keybm552.pdfIn PDF document text
    • http://familyit.info/14887579590ltj7n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_600e76ab26b77.pdfIn PDF document text
    • http://topcreditscore.info/namugasej8l7ip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465144/normal_5fdd364f7a0ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5fe6f8c6a7619.pdfIn PDF document text
    • http://exampl1214.com/1131780602vmq7v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5ffe92ad172aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_5fdbc52b97c36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_601cf94b2e1cb.pdfIn PDF document text
    • http://stixlife.info/13824994740zr4e4.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/labitajaxatufib/sivegilusutoxomodu.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/zabaloni.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/bleach_brave_soul_mod_apk_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/lapaxoroge.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/kexugagokiwovabu.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_off0000d117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 4944 bytes
SHA-256: 67a2e8700c8dc7ff617356e89edf82cebaf9f9f6f2e2979a4de8720b04790765
font_01_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 11848 bytes
SHA-256: 32d1187476237a10f5c54bdcdf865b5d8c52adb5803448e43e4a37670b428a07
font_02_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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