Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5eff9eb6bbf3f4…

MALICIOUS

PDF

68.1 KB Created: 2020-11-25 23:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8c4ba19e89e16eb2a340ebf2b267e124 SHA-1: 3172c9a30a13b0a5565099022761ae846a2721a7 SHA-256: 5b5eff9eb6bbf3f429df340464dad89613a3044af1b6d4c34cf50337bb6dbf69
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute phishing or malware payloads. The presence of embedded URLs and the overall structure strongly indicate a phishing or redirection attack.

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://traffnew.ru/123?utm_term=parking+in+waikiki PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427085/normal_5fa3732dc2001.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/8587005.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/1690452.pdfIn PDF document text
    • https://sadakijawezawu.weebly.com/uploads/1/3/4/5/134595959/ef86b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_5f92624e8ffe8.pdfIn PDF document text
    • https://sejabekozifox.weebly.com/uploads/1/3/4/2/134266090/rukixemejum.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/a726585dbe0f.pdfIn PDF document text
    • https://berotejenikakoz.weebly.com/uploads/1/3/0/7/130775756/3089309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8d0e9625b57.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/tuval-mitivutupip-lidofe-budisamagesaken.pdfIn PDF document text
    • https://pafofenolaf.weebly.com/uploads/1/3/4/6/134668810/juxuvirutosij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_5fb65e9f0c113.pdfIn PDF document text
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/zetisit_lewej_komoligovusi_valox.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/402fc73e-1a89-4909-bfd4-348ba90dd568/89891151428.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/games_like_civilization_for_android.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_off0000ceea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEA 4800 bytes
SHA-256: b6d444c89d3d082be567b51c0353c093cc48a7fa8d2eb8db62b4a75668034350
font_01_sfnt_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 10748 bytes
SHA-256: 1884f5e052aba52d546b5aae0ad734749acc30d0b606651348a028bde7b8c5d6

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