Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b76df5dc514d876…

MALICIOUS

PDF

67.9 KB Created: 2021-01-17 17:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c5574b863b51eb3f1ea734b283957fca SHA-1: c1d256cf5746f77da80509b0c176933303aba74f SHA-256: 6b76df5dc514d87617e3fd41566479139d3110208bbecc4813c3209c834cda13
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

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
  • 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://traffking.ru/123?utm_term=iata+perishable+cargo+regulations+pdf PDF link annotation
    • https://danawejenig.weebly.com/uploads/1/3/4/4/134499985/4995e414e7.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/79ajagh/magic_dream_tiles_descendants_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_5fd96dbb69e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_5fa441ce5be11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506170/normal_5fe2d0c7c8207.pdfIn PDF document text
    • https://site-1185731.mozfiles.com/files/1185731/vafimawiwewuf.pdfIn PDF document text
    • https://movulejovem.weebly.com/uploads/1/3/4/4/134470355/vobujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_5fa5887ccd807.pdfIn PDF document text
    • https://gazonuzurixe.weebly.com/uploads/1/3/4/4/134485976/lijigerod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fe862c87eaae.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/2mieW4f/horror_zombie_pictures.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473619/normal_5ff5fe6ce1522.pdfIn PDF document text
    • https://nixifekenebuj.weebly.com/uploads/1/3/0/7/130775280/c7a9767dd6.pdfIn PDF document text
    • https://cdn.sqhk.co/zesunotu/2hfhfq8/31155278301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5fd861aeac723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478398/normal_5fbe28f728bb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425010/normal_5fc5b68c86bea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 5492 bytes
SHA-256: 9e7f887693ef0f7bfd1a47442b147e7d45feb9083e397ea118be444e2e06b944
font_01_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 10744 bytes
SHA-256: c52211a8264d4ec976dac8d99f11bb7ffbbab595b66704fa85b5c5b70e9d3eaf

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