Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ac308e01125e66…

MALICIOUS

PDF

82.2 KB Created: 2021-03-14 06:07:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9c8420243744ab617304d2c239f53be5 SHA-1: df6820b6e9af7052927c8e2e89818161f6d75df2 SHA-256: 90ac308e01125e6666e66b25c0021d2dbdb7b7d35fac5626b51bee7bb27e4328
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a malicious redirector, specifically designed to lure users to a malicious URL. The embedded URL `https://crophysi.ru/award?keyword=democratic+leadership+style+in+nursing+pdf` is flagged as malicious. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, likely used as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://crophysi.ru/award?keyword=democratic+leadership+style+in+nursing+pdf In PDF document text
    • https://cdn.sqhk.co/jigixomavola/aeieeij/tanepozosiwuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480591/normal_604453e27955e.pdfIn PDF document text
    • http://antonioita.fun/mechanics_of_materials_timoshenkosf7rv.pdfIn PDF document text
    • http://899themes-demo.ru/xolakotuvutujamikax5ci7.pdfIn PDF document text
    • http://eagleaff.com/28847673898no2xw.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesavif/hjajiid/68513053997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493549/normal_5feecede8e234.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402949/normal_5fe44f1e5565a.pdfIn PDF document text
    • http://rat-red.space/phishing_email_analysis_templatej42by.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461525/normal_5ff5d0785be96.pdfIn PDF document text
    • http://tovarzone.ru/gramatica_espaola_ejerciciosovlx1.pdfIn PDF document text
    • http://ihsteam.ru/does_whirlpool_dishwasher_have_a_filterrghss.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hgzA1Xf/lokicraft_2_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/aq1hhih/british_superbikes_2019.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/vasofirida/sample_management_report_on_internal_control.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/56112638512.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/81895971333.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/aow_3_sorcerer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/5621829121.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_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 5672 bytes
SHA-256: 96ec678f67065df97fa009fb956e11e4a2a12e03efb4b9ff88c8a6cff7572009
font_01_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 10996 bytes
SHA-256: 73c491fe6381d0fb357a10905f6a056301178866cdf3494bc07d5d0051ae9ad8

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