Malicious PDF — malware analysis report

Static analysis result for SHA-256 09832e8986bf3370…

MALICIOUS

PDF

74.2 KB Created: 2021-05-28 22:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a7cce33c329b20fe872311e77c555363 SHA-1: fdde2a9199984957304330f7f6740fe8a2b78745 SHA-256: 09832e8986bf3370ece44f32eef06e74b058a927b47b4d5f8772b358c8fbb83e
222 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are part of a link farm designed to redirect users to malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware distribution. The presence of ClamAV detection and ML flagging further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/123?utm_term=4th+grade+adjectives+worksheets+for+grade+4 In PDF document text
    • https://gulekizusivo.weebly.com/uploads/1/3/5/3/135392766/zimometiziraviratek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_605455f1ccda7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_6057a4dc4ca8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_60345259d7f50.pdfIn PDF document text
    • https://joripirido.weebly.com/uploads/1/3/0/7/130776040/e961e3451fb92.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/7359732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_6018a95fbd0b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467306/normal_5ff0f499dd0db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_604cc2ee5b7b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e62ee64-b8e8-43c6-aa26-35eb34567954/interior_designing_company_website_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216d9e76-baa3-442a-b8a4-4374bf592337/air_force_1_high_blue_and_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e8f397-812c-4451-839a-cc22e76d1ec2/alpine_cda-117_bluetooth_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b2a87e-b92f-40a7-9dcb-088a8b622dd4/34672549842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76c2a4f-d29a-40e2-851d-ab8788c4c895/bozonovowefizuvere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4737e3a-e73b-4021-ae64-13a24ffbef2c/power_probe_3_ez_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84023f22-ea57-4551-badd-79cd1606f4b3/76028071800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c26efea-8bcc-4570-9197-63d79a1a6621/kaberawarirotufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73941743-9f81-45e2-a2ae-0381e6efcc13/pevipasafilemonu.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_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 5536 bytes
SHA-256: 4401fa8493014e21363f7cb56d46202f9750bc95f56eed6fa2579aa21dbdc864
font_01_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 11188 bytes
SHA-256: 313863ed8b350647da5354f443723af1a1eb266a9e4d293c93abf3cdc03c8f09

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