Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a0ba005844bca2…

MALICIOUS

PDF

79.4 KB Created: 2021-03-29 13:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 650e16fd3e21ee9047e05b618ef6b450 SHA-1: ec16a60dac7c5940066b9afeb93e36d7cd1cac14 SHA-256: 87a0ba005844bca276a5502a159c57b0bfc4478bbbe1e2c0fc053b9c2a63bb8f
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'. This URL is likely used to host a phishing page or distribute malware. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious link within the document body is sufficient evidence of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=performance+review+examples+during+covid
    • https://static.s123-cdn-static.com/uploads/4393772/normal_5fc68c3199624.pdf
    • http://vobadixu.22web.org/37447258183.pdf
    • https://static.s123-cdn-static.com/uploads/4407793/normal_5fce9a49301d4.pdf
    • https://cdn-cms.f-static.net/uploads/4384482/normal_600d89ac00ad3.pdf
    • https://cdn-cms.f-static.net/uploads/4446377/normal_6009ec419936f.pdf
    • https://cdn-cms.f-static.net/uploads/4456119/normal_605bec3db4162.pdf
    • http://pilawufatazuka.iblogger.org/19916654078.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2d1b9387-db2e-4754-90ec-d636652d1d12/bushnell_golf_watch_reviews.pdf
    • https://s3.amazonaws.com/gateme/dilikebalu.pdf
    • https://s3.amazonaws.com/rodigapigeta/19195453424.pdf
    • https://uploads.strikinglycdn.com/files/586cc2df-7755-48df-935d-81ce4e3c1c3e/74764060994.pdf
    • http://wemojeduxikuzem.rf.gd/canteen_management_system_project.pdf
    • https://s3.amazonaws.com/sudevejerifu/rabomezofevijuzulefuvo.pdf
    • https://s3.amazonaws.com/nisoxow/kane_chronicles_characters_read_the_books_fanfiction.pdf
    • https://s3.amazonaws.com/xupizewuxere/15409968505.pdf
    • https://s3.amazonaws.com/polojuliragam/compound_nouns_worksheet_grade_6.pdf
    • https://uploads.strikinglycdn.com/files/31df5f25-9526-403f-ac26-71efe01da5f0/romonafakoxor.pdf
    • https://s3.amazonaws.com/sisaxu/35900673071.pdf
    • https://uploads.strikinglycdn.com/files/1c441e0d-c1bc-4063-9cff-0d6e306cd9db/what_does_it_mean_you_dream_about_having_a_baby_boy.pdf
    • http://zexozanut.rf.gd/effective_selling_skills.pdf
    • https://s3.amazonaws.com/daraniwekamidir/jufobunosenuketu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f966.bin
0a3ae895bdbdd14878a6402903c9ee23b1e0852ac845f2ff224aeeadd52e5d8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 5696 bytes
font_01_sfnt_off00010cc6.bin
5521ba602f98d874a9147b1fc32ed57b68d0ea972d68ea7c088b8b4e16ee536e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 10660 bytes

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