Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c5aa751aee12a0…

MALICIOUS

PDF

76.0 KB Created: 2021-03-16 09:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 846c0322589c96fdd61c65a0ee0c77f8 SHA-1: 22e30ed768854b22bd5c60694837d63bc32b1c0c SHA-256: b6c5aa751aee12a0169e6057eff87865e10bee7da0a8eb3eec65d74e3434735a
76 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic indicating an image lure linking to an SEO redirector, specifically pointing to 'https://lozipotod.ru/123?utm_term=alternate+sound+2019'. This suggests a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of an external URI and the overall malicious classification indicate a likely attack pattern involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://lozipotod.ru/123?utm_term=alternate+sound+2019 PDF link annotation
    • https://cdn.sqhk.co/wafudovop/ggd3fUn/84311852040.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/ggi6Vig/64693025132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463264/normal_5feb9d4b8eb47.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/ifAC4jj/yeet_cannon_g1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465018/normal_6002ed8ce0bc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_60247189ab7d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_6039d8b8427ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404290/normal_5fe164f404bbe.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/hjlO6K2/nawikedapagulexemolok.pdfIn PDF document text
    • https://cdn.sqhk.co/nevawanipo/Y9Vgif3/employment_w2_form_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/eTgjxWG/earl_of_sandwich_motel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fcabda68868a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_603ff32ab3888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5fe18d59c4d98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414166/normal_6026ffbbc45cc.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/xakajoziwibi/nakelunademo.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/aston_villa_fifa_20_career_mode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/26427154285.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/kesujatoloxekateriwila.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_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 5288 bytes
SHA-256: 4e7cbd73d32aba5245b9c73abd12e6b9d9139bae3b02f2fcaad9971d29ec7e16
font_01_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 10328 bytes
SHA-256: d06d6c08da78e4a255b9e90c6fdcb62e0d4d8564cac24536f49b6ff2ffbd17d9

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