Malicious PDF — malware analysis report

Static analysis result for SHA-256 173bed029e678da4…

MALICIOUS

PDF

71.3 KB Created: 2021-03-29 21:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1320c207d771587714f8f2395c406800 SHA-1: c0d904218468ad914a34669b509864329d21b791 SHA-256: 173bed029e678da4959154f1f77f083cd589d420dbbec0483169b4b797399c9b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to drive traffic to potentially harmful content.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/award?keyword=creo+parametric+training+pdf PDF link annotation
    • http://markettop.pro/what_to_do_in_your_early_20s7prj8.pdfIn PDF document text
    • https://sebikiwar.weebly.com/uploads/1/3/5/9/135962157/6208259.pdfIn PDF document text
    • http://copyright-services-us.com/misuxitorojujirekotofegjl82.pdfIn PDF document text
    • http://oneitshop.pro/kutanovejamixuxufador2e2vz.pdfIn PDF document text
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/zutokaj-mofuviru-tomipubavi.pdfIn PDF document text
    • https://bisatabezuniv.weebly.com/uploads/1/3/1/3/131398333/83db006dde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_5811a26681d84619b84511775645f4d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/how_to_fix_audio_delay_on_panasonic_tv.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_1c7b687fff76449389832ef620e3e482.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/one_free_carfax_report_coupon.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/sibopexiwafuvurolaludale.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_0e90d82e6fcb43af9b10037e64e6c6dc.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_123ac8d613564c98a890c4cfa689455c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/certificate_of_insurance_form_csio.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/vocabulary_exercises_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/bejeweled_2_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/understanding_comics_scott.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/yahoo_mail_for_pc_windows_xp.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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 5168 bytes
SHA-256: 0a176a3137a0f887a7eeb45c17d81a1c04c383aace76bcb71eb8a5601b3be3b6
font_01_sfnt_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 10844 bytes
SHA-256: 2b3ed16ac01c85d27b1735076e27083657a2da1b57bef013be16247ba603c7bf

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