Malicious PDF — malware analysis report

Static analysis result for SHA-256 570da7bdfee84734…

MALICIOUS

PDF

73.2 KB Created: 2021-05-16 21:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6415586eac7fe66678092bf89f611af2 SHA-1: 8339557eb2655e4b62caab475cb07f98059df844 SHA-256: 570da7bdfee84734e0c1656cd4880e3767e0f4c2ad26aeafc8c010d89e871f1c
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 0.9998

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://jacksth.ru/strik?utm_term=certificate+of+creditable+coverage+sample+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416792/normal_604a019eb5526.pdfIn PDF document text
    • http://loxapul.iblogger.org/jutumaxepozesobasazufokun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_6027ce7d1c53b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_603bae08d39d7.pdfIn PDF document text
    • http://gerujidubona.iblogger.org/learn_english_to_german_language.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481699/normal_6003bcfcc131a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_603255756e088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417656/normal_5feb9acbe48a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483867/normal_5ffdf0ef87699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485810/normal_6061f917eb78f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5fe4b745eb854.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/de841867-ced8-41b4-b52d-3279785ebfdd/boxizavoro.pdfIn PDF document text
    • http://gikawulav.rf.gd/86365689815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9047d21a-13c0-4856-b8ec-d7be3e2c2e82/70913137347.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_64de930044c04eb1ba81f7a16d9e4213.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6726a4-4c2d-4969-ae90-c194c2d2c8ca/zowinuterowegov.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_cf258cc4fc104ff4b79815a5e01fc672.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 5580 bytes
SHA-256: 2394e1cad5caae7c909482f3e960c0016418e22a3b912740d3ca3e7661aeef9b
font_01_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 11032 bytes
SHA-256: 9f57af5f329cee246f57ee7b7511d722bbcde6dd7dbbe19bbcea21f104c92fad

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