Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96104659c0e63af…

MALICIOUS

PDF

90.6 KB Created: 2021-05-27 07:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f98bb12c26f9b0b1130b5422f764df7a SHA-1: 5b86c2310ffe4311e72231110517e37418233791 SHA-256: a96104659c0e63afc06b3a77999194355dad6dfa37ac2f26127607a347a43e0e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host a link farm rather than deliver specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=lincoln+welder+ranger-8+service+manual In PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/6698388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_6061bf45a4a1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386087/normal_6002b3590527f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_6056c4eebf1c8.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/vuziw_pepol_zomij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454558/normal_606206ea88d83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500417/normal_5fe2bc75876bf.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/8837717.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/7786617.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409113/normal_5fde731aaa098.pdfIn PDF document text
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/lepixavuviwed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371023/normal_5fde587dcacce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459792/normal_60134dacbc743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492294/normal_601d61568219e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_606dea99814ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_605573464a18f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5fc78d24343f5.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/64aa4e71-5101-40db-9f3f-dde97f0a3c88/how_to_get_hidden_pictures_on_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c8b90d-8a46-4753-b9ea-43dec3146ef3/13221748041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b510007-d20b-42b3-9c9f-2e41a10df88b/which_of_the_answers_below_correctly_describe_the_cash_over_and_short_account.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa3e4b9-c0d5-467d-b55d-9d9c689cba3f/26897378372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4763a61-d3d1-404c-bd9d-99db22c71733/browning_bps_disassembly_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8c3aa0-4f76-4edc-b7b0-f2f45474592d/60085761581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1ec191-122f-4062-a101-bd68aa973ca7/download_life_certificate_form_for_pensioners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc22c3a-3608-4b95-982e-d991602154a0/understanding_food_principles_and_preparation_6th_edition_free.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_off0001209a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209A 5580 bytes
SHA-256: 64905641c1d7296b086fd0c035c852059c2a696c9d875d48e798be7b26e94bc0
font_01_sfnt_off00013399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13399 11692 bytes
SHA-256: c6bb1a6f17ad1c6d2c5934295e079134a5024afec9caf7af9204c94678b97d16

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