Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab63f81f9d30802…

MALICIOUS

PDF

69.6 KB Created: 2020-11-24 23:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 89edbd78375a12bb8831ebb53a25da34 SHA-1: 728e00ca7bb3d2a72a6a1357fbba4bf0c02ba930 SHA-256: 0ab63f81f9d30802eec8df82ca6cdd255016ea6bc740635b0fff478ab109b43b
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to a school or parent communication. The presence of a malicious redirector strongly suggests an attempt to phish or deliver further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffking.ru/strik?utm_term=sample+letter+to+parents+from+teacher+leaving In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_5fa9d5551ce7b.pdfIn PDF document text
    • https://nixotebiwozo.weebly.com/uploads/1/3/4/6/134667174/gitulukap-wobej-paboxole.pdfIn PDF document text
    • https://rujuzodojavumip.weebly.com/uploads/1/3/4/7/134726220/4096057.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/wezewewemubatob.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/85d87183-6fbc-4aec-91d9-2530464d60d9/76354521122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d7312c-2227-4453-8ec7-49e062e9256e/jegimetevefibupuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42482f55-64c3-4810-8f29-b8f9aade9e0b/16584926020.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/energias_renovables_ventajas_y_desventajas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2e25d4-55b9-4a80-bcb1-c421744f881c/nusiniwerakuxorewezinujo.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/gaana_bollywood_music_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be058dd-42a5-44d9-9f83-409dc3a73058/pixel_gun_3d_guns_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b9be63-265f-4550-b139-8f3a85d4a0be/48311806174.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/xixonimanokapar.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/ispoofer_ipad_download.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_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 5592 bytes
SHA-256: 5945cb66d6577e96763748e5fc4bf9653dd59c9a1dcb245a9c5939476eae04ce
font_01_sfnt_off0000e63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 10260 bytes
SHA-256: cf57df23be136fe0c5b7ff31d72552c00f5431099a57af5f72bbe9fb6b38f0ad

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