Malicious PDF — malware analysis report

Static analysis result for SHA-256 db727cf5100048ab…

MALICIOUS

PDF

98.4 KB Created: 2021-02-16 10:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 020b3970d8550ea896000e449af193a8 SHA-1: 9d971bd93e61a78e9460ff658c16467be8504058 SHA-256: db727cf5100048ab742a03249e47e430e3f6508719570d1abd3bc630e8a825ff
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 flagged by multiple heuristics, including a high-severity rule indicating an image lure linking to an SEO redirector for phishing. The ML classifier and ClamAV also identified it as malicious. The primary IOC is the external URI which is part of the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/aws?utm_term=how+to+say+blended+learning+in+arabic PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481673/normal_5fd24c71774c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418584/normal_5ff969d877d64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478683/normal_6009893697006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478125/normal_5ff047cd1fc74.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/MtieLnq/nopobaz.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/ifih1t4/fexulemasuwix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376101/normal_5ff161d2ad582.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/eibygh0/snakehead_fish_for_sale_in_malaysia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_6022afc1bf5a7.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/RiajeD3/ruvemonula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463263/normal_5fd815dcecbda.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/dib0jCh/ding_dong_music_download_mp3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413363/normal_5fc5aabd6d7a2.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/nokiva/11516760743.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/limugonoxer.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001440b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1440B 31856 bytes
SHA-256: c55ff10f956258e0f00181a1b4fc88281a45309721ce4612c4de282b4140de0a
font_00_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 5404 bytes
SHA-256: 9adf928881fa9dd5229f0e246f5ba354d42fa3e3cb39d878cfb1f202b2ad82c4
font_01_sfnt_off00011eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB2 11100 bytes
SHA-256: f6d9b526ead8d455177799bf99aa580b6e88fba37e6df2a4658527ac6c146a48

Open this report in the interactive analyzer, or submit your own file for analysis.