Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a3c9cf062fb4d2…

MALICIOUS

PDF

75.5 KB Created: 2021-02-26 03:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 794a4e7f312ea70f9c7a644f628da930 SHA-1: 88d51f0132b89ae93076fa1458861cf4dcbae33d SHA-256: 63a3c9cf062fb4d25ff3fdc5046e7099a650b0c590f2a29e7c3e2b0db8af244e
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=cold+equations+quotes PDF link annotation
    • https://tatisosef.weebly.com/uploads/1/3/5/3/135333589/c71be90e.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/12861203137.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/ZyHP5hf/angie_s_list_appliance_repair_voorhees.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/muwasubaw.pdfIn PDF document text
    • http://davizaxokekibe.iblogger.org/gilajof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5ff307146f202.pdfIn PDF document text
    • https://fivaxozokudok.weebly.com/uploads/1/3/6/0/136049694/ae9ffc5.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/ggiidhi/java_games_cheat_codes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_600eae27db59e.pdfIn PDF document text
    • https://cdn.sqhk.co/rukefazox/jRthahb/pabababoturozigudas.pdfIn PDF document text
    • https://nizerekudoni.weebly.com/uploads/1/3/5/3/135383630/47f0f5871669.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/jepipejomu.pdfIn PDF document text
    • http://topemuliras.22web.org/ancc_nursing_informatics_certification_study_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447095/normal_602bb3ab28faf.pdfIn PDF document text
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/807d32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456660/normal_60006d850c314.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/jutenojamega/lirolekogegaf.pdfIn PDF document text
    • http://pasigajixivete.epizy.com/saxegogaj.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_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 4756 bytes
SHA-256: 1fccafea41d15c7c77062ced55de76e27b8372cd0961688f422921ca91796297
font_01_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 10772 bytes
SHA-256: 4435604091b8c9ae757876a1a3107b48d3d515c4e3864f15456346e39728c65b

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