Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffa24dc576eec0e…

MALICIOUS

PDF

73.9 KB Created: 2021-06-01 18:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e6bc166a1506ae3b78f5a713a5e7880d SHA-1: c8d53c36d87bc223d9bd21b9f52e629133658028 SHA-256: 6ffa24dc576eec0e45bbb451d2f59d3cbdebedce836c6ba2784fade463a3813e
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://midufefew.ru/123?utm_term=lab+attendant+answer+key+2017 PDF link annotation
    • https://lotuvimipel.weebly.com/uploads/1/3/0/7/130739731/3031320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_60155bf28320f.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/rezeriwijororujoved.pdfIn PDF document text
    • https://naletonuve.weebly.com/uploads/1/3/4/3/134381452/7e9bd19c66ae8f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_6057be12c5e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_603a54a318bba.pdfIn PDF document text
    • https://sevanilab.weebly.com/uploads/1/3/1/4/131437268/8204814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450036/normal_600907d280cf9.pdfIn PDF document text
    • https://mamonaxerif.weebly.com/uploads/1/3/5/3/135347384/dcbf9d052c6e.pdfIn PDF document text
    • https://zexivuwesime.weebly.com/uploads/1/3/4/3/134356920/walobonebir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_6035a3da48e7d.pdfIn PDF document text
    • https://pasodevoz.weebly.com/uploads/1/3/5/3/135345373/9492885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488116/normal_5ff5690d8685b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4393635/normal_60b4fdd22d945.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/f3895d50-5cd0-4952-9cbd-54b020372416/53339248381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0c4ce0-09ba-41a3-819b-e8f11d893df4/48028939776.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144443019/basic_dutch_a_grammar_and_workbook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de3c9849-060c-47a8-9de2-187b66214ed2/23801872196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4fc539-0baf-4554-a6e5-a5c4f6cdf7dd/jarobadedipoxabetabel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd373990-9884-4bb5-882b-ad9fc20047e3/what_does_this_mean_in_python.pdfIn PDF document text
    • http://zajozote.pbworks.com/w/file/fetch/144455976/sentido_literario_y_figurado_ejemplos.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_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 5532 bytes
SHA-256: 733f597aae475c48394cb1d14596880e71394082161d19f1fb31a7d7649fd2ba
font_01_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 10592 bytes
SHA-256: eee10cbf063961bf2d2f4c384de88d5b2d650df8b95922896bd07c0c42488295

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