Malicious PDF — malware analysis report

Static analysis result for SHA-256 b866fce486a40022…

MALICIOUS

PDF

78.2 KB Created: 2021-02-14 22:31:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dbddbcf7dbe10ad86a6f98d20a1baa91 SHA-1: c8c868bbe6f9bdf448e0c2de289663374b28547d SHA-256: b866fce486a4002232f4d57ec922bced1be7fdf602b8c41d69ebc7e32a24dc89
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL that functions as an SEO redirector, likely for phishing purposes. The heuristic firings indicate the document uses an image lure to redirect users to a potentially malicious website, which is a common tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=the+fairly+oddparents+deja+vu+full+episode PDF link annotation
    • https://cdn.sqhk.co/bewewojiwo/sjfochf/bucket_list_friends_summer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502500/normal_6029628cd65f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5ffef82a30502.pdfIn PDF document text
    • http://normab-id.com/bugazigeribolobaxagoq7i4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_6021450d55bbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371258/normal_5fe42b2dd46e5.pdfIn PDF document text
    • http://ejinaya.com/nanumiliikudb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491432/normal_5ff3e7ffb0cc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459170/normal_5ff8278d04a14.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/JhgigjP/74477778341.pdfIn PDF document text
    • http://trysol.xyz/hakone_onsen_japan_guideq1j84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_601dfcde6917b.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/3bnCr57/how_can_i_boost_my_viral_load.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/igdhdol/30444889204.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/rozebofukixus/cydia_installer_mac_free.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_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 5316 bytes
SHA-256: 66aa22409da844fd12f7e239924febb4bf75fc3ff1eb5577390629fefa4dec50
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 10200 bytes
SHA-256: 7503a6496a733e577000b1daae71c2533a34d13b3e4c755ac79f632a07fef477

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