Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3f43b97522071d…

MALICIOUS

PDF

76.3 KB Created: 2021-03-27 10:25:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5833edaa9cfe72b11c883bbf0bf4ce64 SHA-1: b814eea6d89c9c3b12e97f2d9a8e592cc334f829 SHA-256: ec3f43b97522071d1a5044aa66823a28e2bb5ed60b3b0c6a81e6acb135fc7d32
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document employs social engineering by presenting a lure for a browser extension or update, a known method for distributing malware and stealing credentials. Heuristics indicate it functions as a link farm and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URLs point to potentially malicious or disposable hosting, reinforcing the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=citibank+legal+department PDF link annotation
    • http://xolimaked.iblogger.org/wujomeravinilawaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455375/normal_5ffb86b44f381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376852/normal_60435d4216efb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_5fdb77281da2a.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/id_card_template_doc.pdfIn PDF document text
    • https://cdn.sqhk.co/kupodakojav/Jig8X99/hallmark_movie_called_christmas_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453888/normal_60078a5bebf44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_600c6db7643f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_602ecc0d0340d.pdfIn PDF document text
    • https://cdn.sqhk.co/dufikibagi/iiOK8ji/gudomajibewatowaxovezep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_603285d0b4d9c.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/1PjgslZ/janapada_hadu_free.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/jgCBhfv/handheld_electricity_meter_reading_devices.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/537JicH/download_hack_car_driving_school_2016.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viwukekev.rf.gd/55576542423.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/nujizewed.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/metal_roof_sheets_wickes.pdfIn PDF document text
    • http://bukaduxanob.epizy.com/40220295978.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_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 5212 bytes
SHA-256: 8f644b44e14a6fd52233407d9d2f2857020c0b38cbd8407d7d3e1ffa806089a3
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 12212 bytes
SHA-256: 02d39e41ab63bf6535c2badecdf2a9c7ea080b78f6bb5fca788d09522719b20a

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