Malicious PDF — malware analysis report

Static analysis result for SHA-256 376fe497f364f6af…

MALICIOUS

PDF

79.9 KB Created: 2021-03-24 00:24:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c7c8f6569b4674a09f8cd09822fb0e02 SHA-1: 50dacfda9a19561b31fa0682d9b41410f3a7ad26 SHA-256: 376fe497f364f6affa404a1eb193b0382a38e191e7258c5a2d2e24a715f8bfc7
156 Risk Score

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 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://leonvi.ru/123?utm_term=panaeolus+cinctulus+identification+guide PDF link annotation
    • https://vesetiwavulajed.weebly.com/uploads/1/3/1/3/131381055/e17fcf9413e988.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/virulu_dunomazanera_guzixidibavagom_lalukif.pdfIn PDF document text
    • https://suzujiwome.weebly.com/uploads/1/3/0/7/130776055/2c31e0.pdfIn PDF document text
    • http://dejiloka.22web.org/2000_honda_accord_transmission_service.pdfIn PDF document text
    • http://komumepusaxam.iblogger.org/xonubokepipet.pdfIn PDF document text
    • https://mepapezivodeno.weebly.com/uploads/1/3/0/9/130969154/tisefikawaluto.pdfIn PDF document text
    • https://zigikarorusoto.weebly.com/uploads/1/3/5/3/135351373/1244617.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/poguvelefa/gesapesotinofixoxitu.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/gabidotipudoga.pdfIn PDF document text
    • http://lumolak.rf.gd/aws_certified_developer_dumps.pdfIn PDF document text
    • http://dodarululi.epizy.com/93224622120.pdfIn PDF document text
    • http://viwuleraxukopiz.epizy.com/activity_3_induced_magnetism_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/50445534393.pdfIn PDF document text
    • http://livuwiga.rf.gd/xinakinenuz.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/3332851886.pdfIn PDF document text
    • http://gexukak.epizy.com/air_pollution_research_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/serudiwepezum.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_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 5092 bytes
SHA-256: d9c20c490d53c7fc4249ab2dbd5e8d59050b6c97c0d6e82d04bf42c71b4ef95c
font_01_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 11900 bytes
SHA-256: 35aa96d866eb995099da6e45f29e4df158bfc02fe3559fa8506db727ffd5ca21

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