Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39b476edc060bbf…

MALICIOUS

PDF

68.7 KB Created: 2021-02-13 01:04:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b7bfed93348d138b78d769561e3e7ab6 SHA-1: 71bc7e290621fb0a53b1e86c693618d8c348fa3c SHA-256: d39b476edc060bbf44e8e7e5f976323bfe3060b6b6018afa2e2f61ff0c56a334
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as a phishing trojan. The presence of a large number of external links, specifically identified as a 'PDF_SEO_LINK_FARM', suggests an attempt to direct users to potentially malicious websites. The primary external URI, 'https://baarspo.ru/123?utm_term=northampton+county+register+of+deeds', is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://baarspo.ru/123?utm_term=northampton+county+register+of+deeds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372361/normal_601586bc97af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd63ff592404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_6024704ee5371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496374/normal_5ff83424e4c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_6011d7f40abd3.pdfIn PDF document text
    • https://noturumon.weebly.com/uploads/1/3/0/8/130814868/5b57bcd68ecbb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376101/normal_6007bef0dd714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374951/normal_5ff23e2f17e95.pdfIn PDF document text
    • https://jaxenexeleti.weebly.com/uploads/1/3/5/3/135320290/9036082.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5feb090472de6.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/gujutavevive/witazigisupeputikaz.pdfIn PDF document text
    • http://mafonoxerinomif.epizy.com/temple_run_2_cheats.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/empathy_map_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/90430992298.pdfIn PDF document text
    • http://kavotipuwevir.epizy.com/greythorn_primary_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/eraserheads_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/bose_quietcomfort_25_owner_s_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/37288767050.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/uniforme_significado_sinnimo.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/mini_international_neuropsychiatric_interview_6._0.pdfIn PDF document text
    • http://lowoxewepabetex.rf.gd/gefulozokivefisogavugu.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_off0000ccb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB9 5608 bytes
SHA-256: 604d6edfd5cbeb78a79da7381e62df99880775e6e0715eb6166a006be7cb2d42
font_01_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 10916 bytes
SHA-256: 22736dcfecae3f01ee8a56516a6f982b35794d451a9d513fd59f52b2232e8fb8

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