Malicious PDF — malware analysis report

Static analysis result for SHA-256 2965de35a331d739…

MALICIOUS

PDF

75.6 KB Created: 2021-03-14 10:17:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 616893a19eeb2670c7ac1f51f10e5639 SHA-1: 0e875f976d17eccb13ecfe63908678967fd22278 SHA-256: 2965de35a331d73978c26070ac8916707e0eb47b6b7bc90ff67a396c1ec7ecf8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially harmful sites.

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://kuzutuzo.ru/strik?utm_term=do+electric+fireplaces+provide+heat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457582/normal_5ffcd2322d309.pdfIn PDF document text
    • http://jesawukimefix.mypressonline.com/42230116289.pdfIn PDF document text
    • http://podarokinsta365.site/30406388422jre7z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393791/normal_5fdf0327daf1d.pdfIn PDF document text
    • https://sexevegafuxa.weebly.com/uploads/1/3/6/0/136083832/5182495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476127/normal_5ff535261e990.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/27329.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/fc40e9849b.pdfIn PDF document text
    • http://jobs-ingenieur.best/python_interview_questions_for_data_scientist9ajpf.pdfIn PDF document text
    • https://kunefenirubineb.weebly.com/uploads/1/3/0/7/130739500/4ce40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_8775f1a831bd4197b4fae790d0a25db9.pdf?index=trueIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_b6d3b897a99148c8b9a291aa76c750b1.pdf?index=trueIn PDF document text
    • http://rewuwuja.onlinewebshop.net/mufikorewo.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/mp4_video_converter_online.pdfIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/faguvafu.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/74113308030.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/zaxogoranise.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/929019016.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_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 5304 bytes
SHA-256: 9963bf220bb8d4cec9d1003ade64e4ce3c1b9c6cacf2da596abf4aa98ca21c47
font_01_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 10960 bytes
SHA-256: 1defc220e83bc57d2955879b82dce6bc7e74ad757574a8b34941af3083c30fe0

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