Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccd7cb05429cf75…

MALICIOUS

PDF

82.7 KB Created: 2021-05-27 18:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aa90749ee299acce2597d9e2d5a5f2bd SHA-1: 7268dd83776d38de3b5810afb890126540101c90 SHA-256: fccd7cb05429cf756ad4fb33990bd91df9e4f0c4be71a5ffd01b5c86de78c143
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 0.9997

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://dafemum.ru/strik?utm_term=how+do+you+take+apart+a+little+buddy+heater PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380883/normal_6047f4844a1fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_5fdb0ccc7b1b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_603f695e0ea6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418583/normal_60086ad57d3cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391907/normal_5ff4c9553ff5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481166/normal_60116f2fc3dc1.pdfIn PDF document text
    • https://zokagigapo.weebly.com/uploads/1/3/4/7/134719336/e4efcd17c6c35f.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/e5f98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370072/normal_6002665f66567.pdfIn PDF document text
    • https://vifaseberafu.weebly.com/uploads/1/3/0/9/130969816/6680253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375515/normal_5fdeb3b7e578a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_60354e586f1f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_606d8f720fab7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368503/normal_5fcf22c1ba9a0.pdfIn PDF document text
    • https://vewewiganivobob.weebly.com/uploads/1/3/4/8/134852084/tuvefusiwoki_wezowuso_fotamu.pdfIn PDF document text
    • https://wozuxepu.weebly.com/uploads/1/3/4/4/134478893/raxafux_wozedo_puveteli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_5fdf2519c7855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502464/normal_60492fa6bf5c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fddd31de0efc.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/63592d65-3a7f-407f-88a6-58d3865b5d46/85843907490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e11edf7c-d334-4f52-aec3-505cd681c6c8/93924853096.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_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 5228 bytes
SHA-256: 0a73e285225d5d521db208aa41f3638f5afc79d18ffd5810a08a5508227dd2a8
font_01_sfnt_off000114ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 11484 bytes
SHA-256: 4d47818fc936aed7fa4b422a0e172da5cce7b9e3731adc3e245aaa1a06288afe

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