Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07d4d88c2e936c6…

MALICIOUS

PDF

78.9 KB Created: 2021-03-03 14:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: be3073793993c6c628c6dd20ffa8e343 SHA-1: f631b708f6116674a940a522ce94b5315cac76eb SHA-256: f07d4d88c2e936c6b06be2281a3489112205321204459447ef68b9ad386160e0
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body appears to be obfuscated or corrupted, but the presence of multiple links on disposable hosting suggests a link farm designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://crophysi.ru/strik?utm_term=top+gear+review+lexus+nx+300h In PDF document text
    • https://xalojuxovev.weebly.com/uploads/1/3/0/7/130774978/1815963.pdfIn PDF document text
    • http://copyrightshelpcenter.com/data_mining_notesst67o.pdfIn PDF document text
    • http://dihtyar.online/gokapenenuzexadujo7gkr0.pdfIn PDF document text
    • http://best-ital.fun/nba_2k20_pc_game_system_requirements7fvdb.pdfIn PDF document text
    • https://zovoxokovu.weebly.com/uploads/1/3/5/9/135957880/poxudolowetuluk-xefugolida.pdfIn PDF document text
    • http://allroadkamchatka.ru/pipitoxujapd34eu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478398/normal_5fe6776e5ff9b.pdfIn PDF document text
    • http://gayerkan.com/nakomalisagag3pyv.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/4865076.pdfIn PDF document text
    • http://poopo.ru/cambridge_english_proficiency_2_answerse2nvu.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/night_circus_book_themes.pdfIn PDF document text
    • http://logvoz.ru/parallel_space_lite-_dual_app_apk_downloadumet5.pdfIn PDF document text
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/877d696.pdfIn PDF document text
    • https://dipediras.weebly.com/uploads/1/3/0/7/130739778/9df3c64.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/bakoloj/sowiloko.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/97206031488.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_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 5556 bytes
SHA-256: c79e3e393d5094dc06ac139cd6f4e84ae97a527d30d4da4df58e82e22365bb3c
font_01_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 10084 bytes
SHA-256: 7c3e7db21ccae469784958254165d8a128ab796531207c08e8a98c0084c9a70e