Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4781ce470854f99…

MALICIOUS

PDF

69.6 KB Created: 2021-02-22 02:13:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 34b1582906364bcbb28c131358e035a0 SHA-1: 7c84eccb4d8c2283d50757fae43e2e4bc16a5f52 SHA-256: c4781ce470854f99c5b329eeec9ee8e7a04979e18a3e29b3b0fae83ef0551e23
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://maypoin.ru/strik?utm_term=what+does+error+code+1009+on+netflix+mean PDF link annotation
    • https://cdn.sqhk.co/sadetujadufi/ijijhX3/z_nation_season_3_episode_14_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fe8631ae07b8.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/cjdgegi/infection_fatality_rate_covid_19_usa.pdfIn PDF document text
    • http://xuzejomuxide.22web.org/wejaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_601b621477137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_601ebb28e5a48.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/OL75jf6/skylanders_imaginators_character_not_installed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444638/normal_5fe8823fd280a.pdfIn PDF document text
    • http://nususolajegak.iblogger.org/refunakagegab.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/icghhSW/20151048081.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380393/normal_5ff0ac7aeefd8.pdfIn PDF document text
    • https://retariluwefise.weebly.com/uploads/1/3/4/8/134858211/lidaba-lepovukomowupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://senotujupube.epizy.com/bronya_wutah_video.pdfIn PDF document text
    • http://xaligapuk.epizy.com/47185369108.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/kaspersky_antivirus_2017_app.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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 5692 bytes
SHA-256: 66566024c68ad17c4b7f95de998edd7be6ee26dd7ce3ffbc4066d8005d2622a1
font_01_sfnt_off0000e6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B4 10136 bytes
SHA-256: 9aa27b0c59779541911125c7ae23389c827a9f1a12fb5e11aa8a031fbaaf0a5b

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