Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ccaa58de65054b…

MALICIOUS

PDF

201.3 KB Created: 2021-02-21 21:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 77c249b630424e791a83088c85217829 SHA-1: bcdab0204b86a731388478a4eba31b246b616e35 SHA-256: 90ccaa58de65054b670b3457ff8d7167cd89fa87daf19f95ee685a0af9259e6d
136 Risk Score

Malware Insights

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

The PDF file contains a high-confidence ML detection and a ClamAV signature indicating it is a phishing or trojan. A heuristic identifies an image lure linking to an SEO redirector, specifically 'https://druttle.ru/123?utm_term=uw+platteville+residence+hall+costs', which is designed to trick users into downloading a file or visiting a malicious site. No scripts were extracted, but the overall structure and detection suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://druttle.ru/123?utm_term=uw+platteville+residence+hall+costs PDF link annotation
    • https://cdn.sqhk.co/jesotipo/6oZWyie/soccer_stars_classic.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuniruf/dhjL2k4/todo_cuadros_mexico.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/5jdjdKW/fowawogatesibabubuko.pdfIn PDF document text
    • http://vizionsmc.net/minecraft_jurassic_world_apk_modi73hh.pdfIn PDF document text
    • https://bifixebuwo.weebly.com/uploads/1/3/0/7/130776276/nuvame-nugowanitukevil.pdfIn PDF document text
    • https://dosoludu.weebly.com/uploads/1/3/0/8/130814101/7362547.pdfIn PDF document text
    • http://organicnu.info/873476380338h0k3.pdfIn PDF document text
    • https://tizemafuniture.weebly.com/uploads/1/3/4/6/134636649/688607.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/9003354.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/xetasif/chota_bheem_boat_race_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/how_to_clean_a_singer_featherweight.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/broaching_tool_design.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/dead_space_3_trainer_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/33044057736.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_off0002debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DEBD 5304 bytes
SHA-256: 01b38856b01df0fcbaf58188948dce220a731434b243c7fa42cc750bf3f35fad
font_01_sfnt_off0002f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F0DE 12000 bytes
SHA-256: 1605ed7a699a895a431a37bd0f24a1cee2189bb723058a18b2a602febf1c6650

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