Malicious PDF — malware analysis report

Static analysis result for SHA-256 72af5c5c443b7d4e…

MALICIOUS

PDF

78.3 KB Created: 2021-02-01 20:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f2a4ec523cdc92737d3acdf9e27df9ac SHA-1: 93949e577e38e1d562575186bee7ef8abf9f89be SHA-256: 72af5c5c443b7d4e173272587d2b26dbdd8e5f7910d1deef899ee3aa27f35f9f
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/123?utm_term=haunted+one+5e'. Additionally, ClamAV and an ML classifier flagged the file as malicious. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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/123?utm_term=haunted+one+5e In PDF document text
    • http://yogistika.space/guess_the_tiktokers_age_quiz3x776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_60112a67b96cf.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/herKifd/best_ant_killer_gel_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_600f7bd24de19.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/6hjjihi/56302866460.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/f0idhcO/dominos_voucher_september_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409403/normal_5ff14ab81e042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_6011033f65961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_600a8f9571ab8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378613/normal_600821bb6d025.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453563/normal_5fca90a47feb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_5fd8271aeacc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457573/normal_5ffcd868f183c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_5fcfb9a16a334.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 4596 bytes
SHA-256: 488432e6373119a1f5c50236524be15f0d4a034084c5188e387ff02e6834c17e
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 10868 bytes
SHA-256: f73fbbf9d5067e7aba617063ebc70582bb5bb5b41042a619c1b2aebef2cb3934

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