Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05072681d6fc8fb…

MALICIOUS

PDF

80.4 KB Created: 2021-02-21 11:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9342da9f37e82bac92ea342c56ae6155 SHA-1: 409b9c85719b0831b9ba9873b0cfd1de836196f2 SHA-256: a05072681d6fc8fb925bbf37555ab60d88d68e1c4a6e980d8acb95c3e1d33da1
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains multiple links to known malicious redirectors and is flagged by ML classifiers and ClamAV as malicious. The presence of a 'download' button lure and the overall structure suggest a phishing attempt designed to trick users into downloading further malware. While no scripts were directly extracted, the PDF's nature and linked infrastructure strongly indicate a malicious download workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/123?utm_term=indoor+grow+guide+ebook+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_5fe7f0a8881f4.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/jhaOfdc/51187263350.pdfIn PDF document text
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/kagavelu_getorapudan.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/wopowasemog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_600e5f10f31d1.pdfIn PDF document text
    • http://leadtop.co/62093328419b2wso.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/a83babc14b82c7e.pdfIn PDF document text
    • http://inostrana.com/car_value_nada_guideipw8n.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/Bksgeje/75135216426.pdfIn PDF document text
    • https://femesavez.weebly.com/uploads/1/3/1/3/131383434/4354342.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/ibHgjhg/muvubobowudo.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/ladojenefe/company_letterhead_paper_template.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_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 5048 bytes
SHA-256: e83c345655080e210f2c8470004152780faed0e7287b82e09de1620bacdbeffb
font_01_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 10656 bytes
SHA-256: 0c53c4a2f5a6357765d0194fba7257e8d007da2fe3e1e970a1942dfb8e80e5d4

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