Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dcd81160e26d00…

MALICIOUS

PDF

80.0 KB Created: 2021-03-31 03:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8fd412a058388628f636830c96781e48 SHA-1: 738cedaae37b1ed45d1a9ae1568b51eec62c6c24 SHA-256: 18dcd81160e26d00bca785cfb1e202116e740c2f063b50682d03b447440592c1
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 ClamAV as a phishing trojan and ML classifier indicated high maliciousness. A heuristic identified an image lure linking to an SEO redirector at 'https://vilenefex.ru/wix?keyword=zte+maven+manual', which is likely used for phishing or malware distribution. No scripts were extracted, but the PDF structure and heuristics strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=zte+maven+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453118/normal_5fd34fb7c5d64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_605597dace3b6.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/26gdhgt/21049213290.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/PtsgdfH/padorupuzujepa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409827/normal_5ffc48034a934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_60350911d2577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407989/normal_602ac7e948ec7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497650/normal_5ffe9bc17ab6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd1902ac9770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5fd1e116e20ad.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/BeoMlih/water_marbling_nail_polish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_601460681949b.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/Bheijh4/kathy_rainwater_counselor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5fe061935642d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469136/normal_602c3a84ee61a.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/xisakazelelinim/the_last_dance_encountering_death_and_dying_10th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/17752888699.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/great_fairy_fountain_sheet_music_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/31925621434.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/beyond_531_1.4.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/76285688480.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/wekawexuxufuguf.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 4576 bytes
SHA-256: e6d4bf517a87b3c6bc06049db2c4f7a88802be236f23b07c210146da272fc501
font_01_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 11268 bytes
SHA-256: e808f57c97867dc756baedbd13a016bfdbd4b1c1e28e6743720d5ac852b96364

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