Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ba3c88a0d21ff4…

MALICIOUS

PDF

85.8 KB Created: 2021-03-19 09:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6a2fa5ef62a632531ff7120b2765a27c SHA-1: 446a3dcf00bba8c66dbe8d9ca655acf5efae3149 SHA-256: a1ba3c88a0d21ff47379d3af742c6d4be1a9a807465a29c6672e05cc318b7683
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to an SEO redirector. The ML classifier strongly flagged this PDF as malicious. The embedded URL, https://mezovuduw.ru/award?keyword=chinese+dictionary+pdf+download, is the primary indicator of the phishing destination. No scripts were extracted, but the overall structure and heuristics point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mezovuduw.ru/award?keyword=chinese+dictionary+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414869/normal_5ffd5de1eb0c7.pdfIn PDF document text
    • http://quickpapp.online/mcgraw_hill_connect_teacher_access_code2u081.pdfIn PDF document text
    • http://setefigidoral.iblogger.org/fiximajoxedikazefisebi.pdfIn PDF document text
    • http://iclod.tech/xizimiles2saxb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379969/normal_5ffa764ccf1a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_6046dabd84ee8.pdfIn PDF document text
    • http://leree6.club/fallen_london_favours_guidervm3o.pdfIn PDF document text
    • http://capridigi.com/el_amor_en_tiempos_de_colera_resumen_cortoxzwrr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372086/normal_6000ce4b8643b.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/loneminovu/80056464667.pdfIn PDF document text
    • http://widabuve.epizy.com/15874079783.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/three_forms_of_verb_good.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_4692919579464d838c159900d7e099e3.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_c56011277c254bbfb0d34722c4fbfdbe.pdf?index=trueIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_01381afdd8274ceb9bfcbd6edbceed39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lulelepese/ravamukageditaga.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_c2123301fa754b5280ad32eda99917dc.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_aafa51f340e44d7d9efaf36bf286bab5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/cv_template_free_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/banderas_de_mexico.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_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 5344 bytes
SHA-256: 508ca3bb7d78677f9a10097f9d2d6fa56152c5eb0350e2e104080c59ca0dd291
font_01_sfnt_off00012481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 10960 bytes
SHA-256: f19f1b0de3839bb44424ed623f5eb1059a534099fb7fe2bbe44525f7101665df

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