Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bc70af0a009ad8…

MALICIOUS

PDF

132.7 KB Created: 2021-03-16 11:22:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7df5319a1cd40dd4be7d50356c2d7a3e SHA-1: cb10860d706103c58ca994971ce611edefd2aeb5 SHA-256: 25bc70af0a009ad8d9094bf0cc062bd4adabe2373c9a871b9c227b40b98d1036
186 Risk Score

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-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://ponafet.ru/wix?keyword=pokesav+gen+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476765/normal_600497d07cae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_602b4ef90c855.pdfIn PDF document text
    • https://lerinaxupol.weebly.com/uploads/1/3/4/6/134662503/cb6bc4e90b00406.pdfIn PDF document text
    • https://jasitonil.weebly.com/uploads/1/3/4/0/134096785/4fb76b26.pdfIn PDF document text
    • https://tulugawaluga.weebly.com/uploads/1/3/0/9/130969515/kokuvoja.pdfIn PDF document text
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/dolifitevur.pdfIn PDF document text
    • https://libotavod.weebly.com/uploads/1/3/0/8/130813055/527175.pdfIn PDF document text
    • https://kutenenoki.weebly.com/uploads/1/3/4/7/134704657/782bdc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408186/normal_5fcaf352ce449.pdfIn PDF document text
    • https://sofeparevik.weebly.com/uploads/1/3/4/5/134517226/kemetowunifaxopel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470224/normal_5ff9dccce3f54.pdfIn PDF document text
    • https://bofetolukolun.weebly.com/uploads/1/3/4/0/134018575/pugisedalavamu-nedomup-baroxipa.pdfIn PDF document text
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/3e938a.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/babam.pdfIn PDF document text
    • https://zokanebawabor.weebly.com/uploads/1/3/1/4/131438448/tonizerofokif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_7cd29a25509c41859d9871002dd4430e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/bulixifugipo.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/24095084839.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_6c3982771ea64f94899df5737f06ac8c.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_ef03bda9c578459a992d383c933907ab.pdf?index=trueIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_5a32a67627254202aa50ca8adfa38aef.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B388 4904 bytes
SHA-256: cb38277d63863c0d519cc550edb272684c6c0f5cf1027851e321cb4bdfc69aa5
font_01_sfnt_off0001c462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C462 12504 bytes
SHA-256: a0b9df9034cfff50831f75e3567220b5ffc22e0aa49617d0b0348a0c958483c6
font_02_sfnt_off0001eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEBD 16116 bytes
SHA-256: af71224fa4c0ab8a4959ed0ad3af7c1f81652a6f4c5851925e1d5b19c3ce931a