Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4823c4c9abf6ec…

MALICIOUS

PDF

78.3 KB Created: 2021-02-22 14:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1fba1dd2ffc8afd715c5fadfc56d1731 SHA-1: 74510179ea02c98dd64a015a7b49dc698bae884d SHA-256: fa4823c4c9abf6ec5ed5ad6f7dce916ba39411861be7d945e512d145945f7c10
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=the+science+of+mind+management+book'. This URL is presented in a way that suggests it is related to a book, likely to trick the user into clicking it. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL within the document body is sufficient evidence of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=the+science+of+mind+management+book In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5fe391fd96dcb.pdfIn PDF document text
    • http://goproits.com/75388640653iaecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501374/normal_602abc20e31aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478932/normal_60074a1b3744f.pdfIn PDF document text
    • http://feyakast.online/remo_recover_android_softwarey4p50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467286/normal_5fdad2e7b6f6b.pdfIn PDF document text
    • http://accface.in/javejuk5bxzw.pdfIn PDF document text
    • http://tdsevsvet.ru/jikuvidodolilat62112.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403415/normal_5ff8136626134.pdfIn PDF document text
    • http://the-job.ru/health_science_journal_impact_factorgln45.pdfIn PDF document text
    • http://reduslim-buy.site/65419783643z6p70.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/fejififimaketo/tukuxunewujuvapijokutos.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/chrysler_sebring_2006_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/how_to_do_a_round_loom_set_up.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/kazoxozerop.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/muzukipawu.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/arundhati_tamil_movie_kuttymovies.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_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 5460 bytes
SHA-256: 03ecb47b86a516ed9108e79b27f3fe7d57cd0cd437af4c585bb0d0e907b77a06
font_01_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 6020 bytes
SHA-256: 2e59a5ff3362ebf3b1901822402d7708eb3472ca48abb17610f25471514bf63d
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 11708 bytes
SHA-256: fb7bda44876bdfd12c13338602ae8d201535e20a850e6ec27fa59850bbf34b3c

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