Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3c6cbeeb66bc36…

MALICIOUS

PDF

77.0 KB Created: 2021-03-22 11:24:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0c3897f0cfa2f6e6c549149037245cc3 SHA-1: 55765bf036c03e75d3cd11c5d09bb24b3d4e0f85 SHA-256: ad3c6cbeeb66bc36c3cfab612ad90ea0c00c952eee144a66e685202e14426931
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/strik?utm_term=ubiquitous+400+gre+words+pdf+download PDF link annotation
    • https://cdn.sqhk.co/gapekozuwa/jjd1A9O/lozaguganevozejawotunun.pdfIn PDF document text
    • http://kijewumiw.iblogger.org/51521894588.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/c7ggien/sodogevavenikowajunituxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fdd74bf0fa21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467318/normal_5ff0cf391de6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_603673318b372.pdfIn PDF document text
    • https://cdn.sqhk.co/kotoweraga/nnuigdM/juwozofaputomusoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374196/normal_6005a3406297d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_6046d08366ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_602a49b9a1cea.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/1da8f953-6ad5-43eb-8601-d459ba08283f/how_to_win_hand_to_hand_combat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ab0d26-8673-4d07-a8eb-b9b438a03c53/fonudus.pdfIn PDF document text
    • http://teposowadu.rf.gd/1_peter_4_bible_study_guide.pdfIn PDF document text
    • http://lamupogagu.rf.gd/christmas_carol_book_download.pdfIn PDF document text
    • http://pugupokevimukov.epizy.com/pepujebusevixudugera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d77a42-8667-4b86-9914-5d5974ab86b8/19119381523.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/girikatatuvatak.pdfIn PDF document text
    • http://vitipazapabixu.epizy.com/descargar_wifi_booster_easy_analyzer_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d7c5cc-2c30-4797-ac2d-063efa0847ef/35976060300.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/new_malayalam_movie_fidaa.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_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 5788 bytes
SHA-256: e8594086db174b1f0ceefbaadd5659469920c56cf838eac57d95179fe89e6df1
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 10340 bytes
SHA-256: 62cd4e50dd8505975d246c790c3f1445866abb60a7470cfa2cc6a526db614c60

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