Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3c80efff601da6…

MALICIOUS

PDF

89.2 KB Created: 2021-01-26 21:17:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6144fe0ef08f925722dbdeac8f125bd5 SHA-1: 9d9884592683025db64ccc53cc150f122d1b79df SHA-256: 4c3c80efff601da6b22e4b045fa6c3f9d5a5f9f4581e181c35d4d5ca53e32076
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jottigo.ru/123?utm_term=f2+intermolecular+force+type PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380867/normal_5fe11b182760e.pdfIn PDF document text
    • http://aycotoro8.xyz/fedolukezepafj0d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390323/normal_5febc467275cb.pdfIn PDF document text
    • https://satukaxel.weebly.com/uploads/1/3/5/3/135346341/dawuwafojize-woduwub-kenixujefajebo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vozajaw.rf.gd/mcafee_antivirus_software_for_windows_7.pdfIn PDF document text
    • http://lavavil.rf.gd/recurring_decimals_to_fractions_worksheet.pdfIn PDF document text
    • http://zuluvegutadetu.epizy.com/bascule_jk_synchrone.pdfIn PDF document text
    • http://temekem.epizy.com/advanced_english_dictionary_and_thesaurus_apk_cracked.pdfIn PDF document text
    • http://mogorixonub.rf.gd/dukuvabugokotexowari.pdfIn PDF document text
    • http://tuzasujonumex.epizy.com/aviation_industry_report.pdfIn PDF document text
    • http://vavijirodujozi.rf.gd/51370939216.pdfIn PDF document text
    • http://xuwugufufokiti.epizy.com/terraria_crates_guide.pdfIn PDF document text
    • http://vuruwabudakase.epizy.com/iso_27032_cyber_security_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 5056 bytes
SHA-256: 19d42d7094a75ca6fbe31de01867577a365d853a09622ec02f669940bd8f1227
font_01_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 11584 bytes
SHA-256: ba053bb9a5b11018f2899571ccbc4e626d1944ff73434dc00ca87dbefa2616ee
font_02_sfnt_off000149d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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