Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ff2960bc20077f…

MALICIOUS

PDF

65.5 KB Created: 2020-12-21 19:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 93b047b0bce12728fdb88d98859898e4 SHA-1: 9b0b9644dec9d5eed1fc8cb899e8d8452b41d798 SHA-256: 37ff2960bc20077f7b88aedea9bc5d65de8de6ef8295f4d72395fa9b8e5745a2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/aws?utm_term=the+very+hungry+caterpillar+worksheets+sparklebox PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f998ff2ecc71.pdfIn PDF document text
    • https://lolijejolo.weebly.com/uploads/1/3/4/4/134442146/jiwirotezurifiwobige.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/5669539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5fa988e253573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f9549913547d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_5fc032b064de2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_5fa8875fc5bea.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/443c4c7c-be48-430e-acfe-dd1383360882/target_swot_analysis_recommendations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2816a1ef-dfdb-4d9f-be97-b02ba286ecfe/pro_football_coach_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3588305a-58ac-478d-a79e-a822a99b8f63/jodigogikugajezib.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_off0000c23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23A 5672 bytes
SHA-256: be87d3b0ca465bc40a7a9c4bad37ce9dff28c3399860bb48299bb4e47e502004
font_01_sfnt_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 10472 bytes
SHA-256: d149194db9572bb997094961db355e81b6ca2d771205b9e3aad02396c5c2f8e3