Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e0bbc99ccd7064…

MALICIOUS

PDF

69.1 KB Created: 2021-03-17 17:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 34e02cba990feee119b62038edbeadb6 SHA-1: 51ec8932fbed2c55633b06f39bf1b01065ce238a SHA-256: 51e0bbc99ccd706461e6e3fcb9e11b681fe3cc0ac5e822c3d12d31afb3f7139f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/wix?keyword=ufc+242+free+stream+reddit PDF link annotation
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/6244173.pdfIn PDF document text
    • https://rinilevewabidu.weebly.com/uploads/1/3/1/3/131382630/8830558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446500/normal_6019a8774b65f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5fdedc05bb364.pdfIn PDF document text
    • https://guferewefozitak.weebly.com/uploads/1/3/4/3/134393558/4211200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408995/normal_5fde83972d8cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445882/normal_5ffcdf23ec336.pdfIn PDF document text
    • https://lomedalepa.weebly.com/uploads/1/3/4/4/134438906/7844413.pdfIn PDF document text
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/608f10b5b5e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457330/normal_5ffa83877faec.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/959d9c16-8043-4fdf-b76c-5d5a8b3f6886/safety_insurance_company_rating.pdfIn PDF document text
    • https://ce5d016b-e5fb-4004-af8f-35f61b829e22.filesusr.com/ugd/d7d7f8_9e6d240123594c99b01aaa5b8df7eb0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/179bd029-fdd2-4c95-ada0-187974b99a36/50722729396.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_4c2914a345654b2ba1b4a5a3d2f6f0bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54aafbba-1697-4161-a265-c58fb572c653/a_number_decreased_by_8_is_at_most_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443e3af5-d1ac-42b9-8f3d-de8a6d6e62f3/my_dyson_dc16_keeps_cutting_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad1f4ee-1770-4bd4-a8d7-512d6250d838/exerpeutic_900xl_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34814f0-7ccc-4023-be90-37628e482a75/hnsel_und_gretel_film_2007.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_a48f2fce4244445fb5f21773fb9fb995.pdf?index=trueIn 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_off0000ce5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 5344 bytes
SHA-256: d4439ae3670c3dc37760eea90f1fc7ae7b0d44b6c23db1821ab715e772a4374c
font_01_sfnt_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 11276 bytes
SHA-256: 6e42d2f578de56639ea1606e64c21852af09976c518832aaa6ee15737cac7bd1

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