Malicious PDF — malware analysis report

Static analysis result for SHA-256 def87fff34cf7759…

MALICIOUS

PDF

61.3 KB Created: 2020-11-23 11:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ca8dc459b3c6e0d1af0b0021a2e063a4 SHA-1: 41e68bdc055483aafe1f5f5f59aee5a535a42848 SHA-256: def87fff34cf775957d9b0630ce27a7bffb3476679eda75754cd77b755c02fc4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and link to potentially harmful content.

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://trafftec.ru/123?utm_term=bee+gees+i%2527ve+gotta+get+a+message+to+you+chords PDF link annotation
    • https://lifowedo.weebly.com/uploads/1/3/4/7/134707215/vexafik.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/bopaguw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5f90869fb9fc7.pdfIn PDF document text
    • https://letolikasepa.weebly.com/uploads/1/3/4/6/134625664/mozanatalu.pdfIn PDF document text
    • https://bajekilirevi.weebly.com/uploads/1/3/4/8/134868337/6e88b8.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/01d7af35.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/38ccba87-d083-4a2b-8d84-b07bcd6fff05/yocan_evolve_plus_xl_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/25936715993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef153b3-e005-40a2-9577-bd49c0c8310a/oakley_caveat_brunette_polarized_sunglasses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49cb4a17-9dd5-4a26-ae7d-f579e8a50632/pokemon_moon_battle_tree_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/13989131152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec16ed23-79e0-418b-92ec-6cb4707905ac/graphics.h_in_c_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc4faf2-b6e9-42f8-9a55-f273dab4da92/migotepuvenavenorezadi.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_off0000b1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B0 5564 bytes
SHA-256: ea18e651afb61ad77ad07aab5fd364cda7c04e1073f06f9463fe93f823e4e3b5
font_01_sfnt_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 10636 bytes
SHA-256: 8853ec3d717a7ddee5f314a3c48187e53ae3d34b640a65bae34c34a47b7ebe1e

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