Malicious PDF — malware analysis report

Static analysis result for SHA-256 9241f065c99903e1…

MALICIOUS

PDF

68.8 KB Created: 2020-11-13 14:07:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ca47c8c888d106c5dd7e3ad7f21ab56a SHA-1: 186720cb8a38bc7ec0d7a2c2351872ecac232cb0 SHA-256: 9241f065c99903e153b6ce662650de3d0e218c747de2f37f4e514121e2de7553
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links pointing to external resources, with one link identified as a malicious redirector. The heuristic firings indicate this is a link farm designed to direct users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/strik?utm_term=pdf+tuesdays+with+morrie In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5f99aaee429cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5f994558794d2.pdfIn PDF document text
    • https://gogesatita.weebly.com/uploads/1/3/4/3/134321397/sulobakoz.pdfIn PDF document text
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/dubaxaligiwiso-tusola-xatagi-kaworij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5fa154011b126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f88a37768068.pdfIn PDF document text
    • https://nukafezika.weebly.com/uploads/1/3/4/5/134510633/d7a8310d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f8a6acd93abc.pdfIn PDF document text
    • https://sagoxanoku.weebly.com/uploads/1/3/4/3/134350044/pefoperef.pdfIn PDF document text
    • https://tejovobomogopiz.weebly.com/uploads/1/3/4/6/134626725/fulexurarukife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5f8e2761f1371.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/dabuwosevitumiw.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/febabcac-689d-4297-8677-683a859c10e1/kore_dizileri_izle_trke_altyaz.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_off0000ba76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA76 5308 bytes
SHA-256: 1168df57cb85a94ccc43e49487189720321c62c7401753b527784298c4f545dd
font_01_sfnt_off0000cc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC78 10612 bytes
SHA-256: f9c0bfbb7c2e7127d7295dd0a55b86b60d0d75c5462acad207470bf13891d492
font_02_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 16416 bytes
SHA-256: cb9031d1f0fe8e831e756bb5e8874380bf69cfce027a33a060c7188ef7ffd1d3

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