Malicious PDF — malware analysis report

Static analysis result for SHA-256 00d7e8bc2ec1f9d3…

MALICIOUS

PDF

67.7 KB Created: 2021-02-15 16:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f1393041ee15d2a9cfd5026f2dfd40a1 SHA-1: 27aea43e74f2523bc9ea43eded508f78ca8ff37a SHA-256: 00d7e8bc2ec1f9d39d39d657bd4ae5d02875f5f23eb294f3ccc3e2a8b99964c2
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 ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to 'cognitive therapy' and 'wkhtmltopdf', likely a lure to direct users to malicious URLs such as https://bologen.ru/strik?utm_term=what+is+the+cognitive+therapy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=what+is+the+cognitive+therapy PDF link annotation
    • https://tamilazubi.weebly.com/uploads/1/3/4/6/134604156/fokoro-fobadibasafa-wumubimane.pdfIn PDF document text
    • http://nimojojisox.22web.org/suzezalimiliwotu.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/4857139.pdfIn PDF document text
    • https://pasugewu.weebly.com/uploads/1/3/1/0/131071180/tagezesafakevifejot.pdfIn PDF document text
    • https://vuwezamubom.weebly.com/uploads/1/3/0/8/130814902/vukose.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/4757821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471960/normal_5ff6752cc6368.pdfIn PDF document text
    • https://xujeloza.weebly.com/uploads/1/3/4/0/134096435/9400271.pdfIn PDF document text
    • http://bataxabinon.22web.org/apple_inc_company_profile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pobixedele/95686335871.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/asphalt_7_1._1._1_mod_apk.pdfIn PDF document text
    • http://wuniwivufe.rf.gd/54989042882.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_off0000cb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 5336 bytes
SHA-256: bed1d371efcea53ea0117be65684ecec1e1d0a5059919f3366eb98c52b95f27d
font_01_sfnt_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 10300 bytes
SHA-256: 7c3d03886fc5e9dff8b5c779f8b6725902512360dd0845eb81f81b9d63520d56

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