Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bb17a3256c4c47…

MALICIOUS

PDF

42.9 KB Created: 2020-11-08 23:48:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d928cbf3503d791a3855098f736f1de7 SHA-1: 1ec4e24bbd26b21b8daf07fc778495db7db2761b SHA-256: 22bb17a3256c4c47347bf66005a5acf0dea920bc16a1df85a1b6ee5e3dc44fce
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts a large number of external links, many of which are PDFs. One of the embedded URLs, 'https://trafficel.ru/123?keyword=rescind+definition+verb', is flagged as unknown reputation and is likely part of the malicious link farm. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure suggests an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafficel.ru/123?keyword=rescind+definition+verb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5f9596aeabb85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414696/normal_5f9841185ef2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/72014602609.pdfIn PDF document text
    • https://sebuwisawos.files.wordpress.com/2020/11/fipupojuretis.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/25916407515.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb4b738a-71db-4b0e-9965-bd85d28475e5/86104926551.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/skechers_commercial_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe595f6-2e86-46cd-8f72-e256b75e50ed/jegilufikonozefofalif.pdfIn PDF document text
    • https://mikifisilub.files.wordpress.com/2020/11/52101485761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ba6b6f-4673-4490-9aa5-daf75aa40ab4/44447279142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/805c009c-9d56-41f0-becd-ccef641adcad/26589646464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a1c4a6-a617-4638-b80f-734d2a310da1/dotutojanusaxejalexi.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/ctet_exam_paper_2019_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/pathfinder_race_builder_app.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_off000064f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F1 4980 bytes
SHA-256: fe9b8b224ae9365e43f945154685ce74bcb5b2a4a9a9748421e2e37c46b32263
font_01_sfnt_off00007600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7600 11808 bytes
SHA-256: 635db8177f634c67a8aef1c6434f68cf9876cd93a1d55fa3e366baf361857cd6

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