Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b28a680d66bf53…

MALICIOUS

PDF

60.8 KB Created: 2020-11-09 22:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bf1931ae8c2e7af844dc518bd5a1d480 SHA-1: 6df244c5ab7a6f4ed95f9c3676579d7a9561aae9 SHA-256: 81b28a680d66bf535e28028e7e3fd7d59d7b973112c28a6e995b5adae07fa0b4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically pointing to 'trafftec.ru' and disguised as a worksheet answer key. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?keyword=quadratic+modeling+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5f89287f6b9ee.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/leniniwugezabesobe.pdfIn PDF document text
    • https://gejimedetudumi.weebly.com/uploads/1/3/3/9/133997730/vebilisawita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_5f90dfdb7ef4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f8820666435c.pdfIn PDF document text
    • https://pijezokonogoxa.weebly.com/uploads/1/3/4/3/134308979/malid-xukikazure-gubelosixiluxax-gidoveled.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419642/normal_5f9d2b49ebb19.pdfIn PDF document text
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/2776395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_5f953dfa383ea.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/e9297741-4e77-48f1-a56c-898a184c1948/vugasiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14e66eb-96d8-4f28-a1e4-99cf1b81b9e6/rififuvinefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cf4d38-d078-4b61-8f24-f73f1ab7ab67/fotesejuwuzofadizudubirip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c068176-e1d5-40a6-ba5c-fbf0eafc57e9/paladefobebemuxuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1115d6-aadd-4531-ba0a-ea24ebc8c80c/82185236383.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_off0000b240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB240 5568 bytes
SHA-256: 0e60365cfad480fdb0a4be347362b30727158f4f4e4981367ddb38042e648cc3
font_01_sfnt_off0000c518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC518 9720 bytes
SHA-256: fbad5edc1b97b5d5342e755d8a3d4dad348dcdcdf881b75a430fd124498ec4d8

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