Malicious PDF — malware analysis report

Static analysis result for SHA-256 6134f8d1bc5413bd…

MALICIOUS

PDF

76.9 KB Created: 2020-11-10 19:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0a12346639444005c3ed7ca87aa7e030 SHA-1: 94418ad5b936a571488e9f40ae746fa9b0b37b79 SHA-256: 6134f8d1bc5413bd0234b664f451367eac5e471b94087a3281c4abfdc64447a3
136 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating it's an SEO UTM redirector for phishing, specifically a 'free-download' lure. The embedded URL `https://trafficel.ru/123?keyword=rate+my+teacher+marshall+middle+school` is the primary IOC. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing attempt designed to lead the user to a malicious site.

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
  • 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://trafficel.ru/123?keyword=rate+my+teacher+marshall+middle+school PDF link annotation
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/vujibawefil-vozomodifate-sajobesiwi-bezaxexizomon.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/9044166.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/9985793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_5f8eaab6092b2.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/domegagowevag/servsafe_manager_7th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/camera_lenses_types.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/rca_rcr003rwd_remote_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edba5f99-5db9-4afc-ba40-e6dd41de0214/guwinaletiwapiwujigopipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445198f3-a03a-4459-a142-75bab2785883/gipepegeguta.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/koropavibowelamovapolota.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/84041736195.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/23080733767.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/z_scores_worksheet_with_answers.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_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 5288 bytes
SHA-256: fe6c6418f42e8cdaba18e647b41ea222432597c2a70e549ed8475d550ea7175e
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 10916 bytes
SHA-256: 0514496d5f52d1a6ce537ad4002cc1a0e7f04f181d10e2f104b6d12b99c84839