Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bffd8ad88ebda0…

MALICIOUS

PDF

68.4 KB Created: 2020-11-24 12:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ad58747c42d0d920f034a31c5fea9ad6 SHA-1: ad71c07d0ce428ee04181c7a0da7f66ccf004335 SHA-256: 78bffd8ad88ebda0b109adce305798bffbe75220a0695db7abda36bf87c50075
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://traffmen.ru/strik?utm_term=facts+and+opinions+worksheets+grade+5'. It also exhibits characteristics of a PDF link farm, with numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=facts+and+opinions+worksheets+grade+5 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5fa33902baffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5f99163ded342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_5f9bad187c177.pdfIn PDF document text
    • https://duxebiforup.weebly.com/uploads/1/3/4/0/134013009/3286211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375703/normal_5f8b62a1b772c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/isoniazid_davis_drug_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/sales_invoice_report_in_sap_b1.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/pathfinder_magus_spells_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/freddie_mac_home_possible_gift_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/78159767687.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CC 5324 bytes
SHA-256: 8d6690b9b29ea95383a0957ca9deec268cfcececfb09f49cc771904e6f45618a
font_01_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 10228 bytes
SHA-256: 49f14dccb1423ffb736d7aab9092bcccf5a0e5b666865a5c2203db306c9b6ff2
font_02_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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