Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2f47f636da7a1c…

MALICIOUS

PDF

77.6 KB Created: 2021-02-28 06:01:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8583d4f69fe6f3ca25611633791f986e SHA-1: 7ed2031b3f2ce8febf12c700810b5d2b8779f8db SHA-256: 8a2f47f636da7a1cdc38faefe486e216716b71f9baf79279f3fe159a24880a0b
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/aws?utm_term=how+often+newborns+should+poop PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4503214/normal_5fcf2e7eace47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_6027c927be705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_602a1993f0aeb.pdfIn PDF document text
    • http://ndfnasg.xyz/39259840299is2g8.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/liminal_thinking_review.pdfIn PDF document text
    • http://dekiweragaf.mywebcommunity.org/mulagigapivuwuvino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5fd974d23b250.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/ace59856b33.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/dell_precision_m4700_drivers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448536/normal_5fdfcb140df10.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/sejepokebakeb_wagukokuw.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_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 5112 bytes
SHA-256: 36d1fd72f9e122da8df583a93756c76a0c9f32a23387074e623dbdcabc769e6f
font_01_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 10796 bytes
SHA-256: 32adbb6ed1514a4d2eb6b8cf1103158cdbfb7c8fd96503997dabfdbe56ed7a8c

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