Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8df2de0cffe9c3…

MALICIOUS

PDF

64.6 KB Created: 2020-12-06 22:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2c8e08df127375d9c14cca5e4f1fc161 SHA-1: 17560c73564f96d8dde74153d99f8d498e6c6acc SHA-256: 3e8df2de0cffe9c3d91141fd673038ef9f3ac0f7b10d9711bad32f8b68a579de
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to external, potentially harmful, content.

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 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.
  • 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://traffset.ru/strik?utm_term=ruth+and+the+green+book+pdf PDF link annotation
    • https://vivorewipaxuje.weebly.com/uploads/1/3/4/3/134365477/59348f6c53ec.pdfIn PDF document text
    • https://tamagokevalagir.weebly.com/uploads/1/3/0/7/130776783/6152118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455387/normal_5fb8f80e59a7c.pdfIn PDF document text
    • https://zemovawid.weebly.com/uploads/1/3/4/6/134608463/5808670.pdfIn PDF document text
    • https://jetabasujupeg.weebly.com/uploads/1/3/4/7/134703241/e34da98e8638c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464852/normal_5fac481c88329.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/0e73d99f-6e1a-4a27-8d4d-e5fd1e83bd78/louis_marx_toys_price_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f59d6664-adcd-4926-a46b-e540b6c58f61/soroptimist_international_of_the_americas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f200221-bb30-4fa3-8a11-d6107d5882c1/bowflex_treadclimber_tc1000_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44043d4-5fc5-4ea7-b4f8-3a3c2a74025e/where_to_buy_dominant_testosterone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd30f17-60f1-4a81-a713-ed43915178db/rugezidatit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e246a19b-e35e-4f69-9b11-b87dd22ec517/jivevisazobu.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_off0000c265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC265 5304 bytes
SHA-256: 1715af01f3d1d32ceebfae81fe6531f9304f60e40161fbae9fa72f05e1e73d04
font_01_sfnt_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 9836 bytes
SHA-256: 4018c3c39bd9c1852b0cb8920a52388124ab7bfb3ec8eef35f5fbc4423481edd

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