Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fda80236925461f…

MALICIOUS

PDF

81.7 KB Created: 2021-02-11 18:28:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a842669049570781f3e2ef572d07730e SHA-1: 0ec2c67cc51e2573d859aeffe1427e941a9d63bf SHA-256: 3fda80236925461ff960e8619c120d982243120f546667370496887295f874dd
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/wix?keyword=horse+isle+2+help+esroh+legends'. This indicates the document's primary purpose is to lure users to a potentially malicious site. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the nature of PDF redirects often involves JavaScript to facilitate the redirection.

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/wix?keyword=horse+isle+2+help+esroh+legends In PDF document text
    • https://cdn.sqhk.co/fegozanodedu/jfGZhjc/background_hd_wallpapers.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/4hj3zgi/34105201452.pdfIn PDF document text
    • https://cdn.sqhk.co/pudinivil/cbiejho/free_online_casino_slots_with_bonus_no_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/W0j8l2I/opera_browser_video_downloader_android.pdfIn PDF document text
    • https://cdn.sqhk.co/vomawoko/1pjaIZD/6859182232.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzededoz/FjatEij/blocky_castle_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463300/normal_601cfda02ad9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_6021caa4d9283.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/iiih7hi/71743618828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372967/normal_5fd091933f54c.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/78094339787zf9qw.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/yjbYiae/mevinimowidoki.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/fgixgcZ/copper_spot_price_per_ounce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451742/normal_5ff5817edc102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393361/normal_60030e75408b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_6024a047ef21f.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_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 5104 bytes
SHA-256: 345d325acf45a12aa2cdc6bb1b7537414ef7c02203bf8717026784c808dec48e
font_01_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 11704 bytes
SHA-256: 7f84c92b9149f0bac5ddb40c8aa8870671a4cd47cfbd8aefc8f9168cd04bece7

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