Malicious PDF — malware analysis report

Static analysis result for SHA-256 196792897e6c8097…

MALICIOUS

PDF

82.1 KB Created: 2021-05-19 00:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f26ab0cd93ce8a55a04f0526e718ce55 SHA-1: cacd812a347d280b461d4a781bfe828b7bb76713 SHA-256: 196792897e6c8097479112f4aee603e63ccc6e0a441fef9d1b491c8ee6cb692b
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it uses an image lure to redirect users to an SEO redirector. The embedded URL, 'https://kuzutuzo.ru/strik?utm_term=pegem+kpss+lisans+matematik+%25C3%25A7%25C3%25B6z%25C3%25BCml%25C3%25BC+soru+bankas%25C4%25B1', is flagged as a potential phishing or malware download link. Although no scripts were explicitly extracted, the PDF structure and the nature of the redirector suggest an attempt to trick users into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://kuzutuzo.ru/strik?utm_term=pegem+kpss+lisans+matematik+%25C3%25A7%25C3%25B6z%25C3%25BCml%25C3%25BC+soru+bankas%25C4%25B1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462037/normal_5fefc5e12a283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_604e6590dc4dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_603dfb0b50c64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416506/normal_5fee9068ab3ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_6044fa63598f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501645/normal_5fd5f5346a324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_6022c9ca2121e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_601701971bac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416139/normal_60186c53424f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/62448973-23d8-405a-a8fd-48e4eccee727/brk_first_alert_9120b_battery_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/avery_5_tab_clear_label_dividers_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/93364483541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4153ff7e-115c-4462-922a-84222c7a4c60/302478941.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/kusuraretivazebubat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f836586-9acd-407e-b319-ddb3374107a2/58367827280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17219be3-9f36-40de-a8eb-fc886126f931/how_do_you_crochet_a_simple_baby_blanket_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324a9c77-e0bf-43cb-a454-1d7d32269ebc/what_is_dw1_transmission_fluid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266e3e1b-01f8-4351-b66b-e87f99b0a5ef/78686237545.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/rekuropake.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/33404057527.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 5868 bytes
SHA-256: 6c0d63fd88ab219cb5f68575ee67b4c3247a1f7aba0ea544917523a1cc528b1f
font_01_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 11380 bytes
SHA-256: df4bbb931e188c78dc8404c35ce98c8427cb3c269e89baebef486a74e030b9a9

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