Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b94adceeeb0661…

MALICIOUS

PDF

80.1 KB Created: 2021-06-10 00:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 810bf1ac082d3ad0fe5f8c4b10fd8223 SHA-1: 8072c4bc4c6555a3f292b7302542d595da1bc264 SHA-256: 66b94adceeeb0661d6404c8e44375684a1c076ccc28c3c61ffcd554a2ddfd4e0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://catamma.ru/pbw?utm_term=how+to+get+deleted+photos+after+factory+reset PDF link annotation
    • https://wefopizek.weebly.com/uploads/1/3/4/8/134849363/2fedff417d3005c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472766/normal_5fcc86f3a5350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392452/normal_6041e8170187d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_60586ecd27531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_600b9fa7132bb.pdfIn PDF document text
    • https://motadonikedubi.weebly.com/uploads/1/3/1/8/131856170/denuta-xevisa.pdfIn PDF document text
    • https://rojobasexadef.weebly.com/uploads/1/3/2/7/132711954/fovogixinobote.pdfIn PDF document text
    • https://bazulezegit.weebly.com/uploads/1/3/4/3/134372971/limaber-kiwazafomezinix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_60b919ae320c9.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/6439898.pdfIn PDF document text
    • https://tigerabedudutid.weebly.com/uploads/1/3/5/3/135304069/viwovij.pdfIn PDF document text
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/435185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420018/normal_5ff8dbda856bd.pdfIn PDF document text
    • https://razovifizekojo.weebly.com/uploads/1/3/4/4/134439397/josew_bajigoposije_jetedagisis_gelosapizuveles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5fc7752b3cd7d.pdfIn PDF document text
    • https://mowewudogib.weebly.com/uploads/1/3/5/3/135310369/0d57a64260ac.pdfIn PDF document text
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/luxipiwefise-xovasonabipu.pdfIn PDF document text
    • https://pegalidaxib.weebly.com/uploads/1/3/4/6/134632492/2130114.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/71053db6-7be8-4ec1-80f3-178bfe3b5991/logitech_z-5500_price_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12e382f0-b7c2-49cd-8038-321bff8f9e7c/pizebezodegukuruke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a953c1e-dc81-40e2-bf14-f34ce73ea077/lamikireju.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_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 5572 bytes
SHA-256: 9700c1322002309f38c5c2d862aa72bf8955be4c920a839be46cfb7f44ebb197
font_01_sfnt_off00010d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 10728 bytes
SHA-256: b9a4910d7759fcfb0f469b24df1c37b2bd06049ff26872628fafee1615cedd04

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