Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aade5b770ce41cf…

MALICIOUS

PDF

73.3 KB Created: 2021-04-20 13:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8951a381a295d61044a9abfd590b7567 SHA-1: 261b62c5d7e4439e54bfa013086203e46e1511c8 SHA-256: 1aade5b770ce41cfa077bac20c84f1edd9b9282598deeebfde7b7975b16790ea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

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 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://midufefew.ru/strik?utm_term=understanding+food+principles+and+preparation+6th+ed PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455375/normal_5fee748a58bc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446161/normal_606a439bd7aff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_5fd9138d726f3.pdfIn PDF document text
    • http://majubavilusuda.iblogger.org/dometic_awning_replacement_vinyl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490371/normal_5ff1d4f822d84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pofiwun.rf.gd/ashurst_training_contract_application_form.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_e3ea8fcbe43746e59b7afa5260c65088.pdf?index=trueIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_527008aa56684c71b96cfe2c4a08f6db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebad07e-8dd6-4eb9-8637-34303fcf8979/27459688251.pdfIn PDF document text
    • http://topemuzopapegu.epizy.com/6th_grade_worksheets_social_studies.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/40574221937.pdfIn PDF document text
    • http://juzuruwe.rf.gd/homophone_worksheet_first_grade.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_f73066369dcc44cf95864ef77919d162.pdf?index=trueIn PDF document text
    • http://wovexinilejo.rf.gd/fifty_shades_trilogy_books_barnes_and_noble.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/49614692039.pdfIn PDF document text
    • http://fosarasopu.rf.gd/19985832946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9908cfd-3d0c-4524-b565-b015c9cd9ca2/wozasajigogesad.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_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 5560 bytes
SHA-256: 1a4a92e2b15b9b5a4ea18389213351957307efe4bdb07e172cd4b48072a58c53
font_01_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 11552 bytes
SHA-256: 07cdf76d3af2ce9789e843466c0d123770ec77e856a782243fdf05338e93236e

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