Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8efbf2c0858030…

MALICIOUS

PDF

99.9 KB Created: 2021-03-17 20:27:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ad822e02e400bc395aa012742d213cd0 SHA-1: 5ca98ab815539632f16b5d4ce79feb2a73e5212a SHA-256: 1c8efbf2c0858030dd15cd7630fc4e1268688da1a0242e81f8245745caa4318d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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/wix?keyword=n+switch+games+2019 In PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/8821c7c1243c0eb.pdfIn PDF document text
    • https://dejokorakas.weebly.com/uploads/1/3/1/3/131379117/71e49e9cbc6.pdfIn PDF document text
    • https://jivekale.weebly.com/uploads/1/3/4/3/134319103/3455179.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/ChhWN3U/barcode_scanner_iphone_case.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/cygFgjK/the_pyramids_of_egypt_history.pdfIn PDF document text
    • http://kopatizukuxaluj.scienceontheweb.net/trustworthiness_and_credibility_in_qualitative_research.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/fonolax.pdfIn PDF document text
    • http://zakapanu.iblogger.org/83391864356.pdfIn PDF document text
    • https://vekatofe.weebly.com/uploads/1/3/0/7/130775682/d43e9de5c054.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_28b92cf887f44fadab380999e19f3c90.pdf?index=trueIn PDF document text
    • http://jowosos.myartsonline.com/ranuxegivenejawafixut.pdfIn PDF document text
    • http://fiviwuzovalexop.rf.gd/android_apps_maker_apk.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_62331b537fb34892b77b4001573e8bcb.pdf?index=trueIn PDF document text
    • http://wunopuzanejeji.rf.gd/comma_usage_quiz_with_answers.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/le_petit_prince_summary_french.pdfIn PDF document text
    • http://jonuvavito.epizy.com/trimble_tsc3_wont_connect_to_internet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CF 5628 bytes
SHA-256: 43fe5d2e99efbc25bf35a7d2fd622906e5fb58a95bf5f4aaee65308e0a05e192
font_01_sfnt_off000143ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143ED 12716 bytes
SHA-256: 73cc10c34955f1e8c9df75fe1c252cdd01c09828b26a29dbec45e23e346f7826
font_02_sfnt_off00016e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E03 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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