Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9a807d5525c5c0…

MALICIOUS

PDF

107.6 KB Created: 2021-02-13 00:29:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 15e0650b1be6821e52347cf6028975ed SHA-1: 256114263872cd6d5fcf03c08a2ac83a64c9f1bd SHA-256: 4e9a807d5525c5c084e89ae2e4fb0f42aed03183b79c0e4ea92afec6f1752f77
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=curl+of+vector+field+formula In PDF document text
    • https://cdn.sqhk.co/lijuwezasip/aDX5TzH/guxugizelojub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_602256e50b39c.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/mikebuz_sabef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402261/normal_6003985349612.pdfIn PDF document text
    • https://cdn.sqhk.co/nugunexinazo/jM92icZ/snowflake_meaning_tiktok.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/xjcGgdI/pokemon_center_plush_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501645/normal_5fdeb5a204e89.pdfIn PDF document text
    • https://nuzivepumug.weebly.com/uploads/1/3/1/3/131379706/5157693.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/jchahaP/30168512663.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/hggiehe/siran.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/bofuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vufupu/adblock_plus_apk_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/vitaguwalokulonadu.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/sbi_opening_account_form_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/vepavezo.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/nemidopujesotetuba.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/37746129231.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 4848 bytes
SHA-256: d36088035dfa19e4e97fb0a3ab9d8ca270a5d1b7e9cb239a79b32a3415cc5831
font_01_sfnt_off00014476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14476 16468 bytes
SHA-256: 5800ea697442fd49052063c54ad6955fcf55e085c10d96e72d43f8961c25e31d
font_02_sfnt_off00017956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17956 17080 bytes
SHA-256: d8bdec46be7a02a20a1f62a890e83f83a35ba3dcfa722cd32f6ad31394785270
font_03_sfnt_off00019273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19273 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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