Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b66d4aec3988c8…

MALICIOUS

PDF

72.7 KB Created: 2021-02-19 07:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 398c2b0a919ec937c136e4d028ef02e3 SHA-1: 34851f533104bccec6dfa6ed88335d12d79c7785 SHA-256: c0b66d4aec3988c8d6a9465adf285c565cad10d613e6418d28750a07eb03bdc5
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://baarspo.ru/wix?keyword=graphing+systems+in+standard+form+worksheet PDF link annotation
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/9910634.pdfIn PDF document text
    • https://cdn.sqhk.co/dipopoji/hgSYDUc/87884908455.pdfIn PDF document text
    • http://1offpark.xyz/optical_illusions_art_tutorial9fprl.pdfIn PDF document text
    • http://onatural.space/piwuzidizihc7nr.pdfIn PDF document text
    • http://gnfcns.info/sentencing_guidelines_commercial_burglary218px.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/fjejfr5/jorinaluzajofaxek.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/boluzuridasuj_morojagejozup_gafebesedefa.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/Viiije0/sakuforotowajep.pdfIn PDF document text
    • https://cdn.sqhk.co/rodofusavivi/ic1ifhd/sunozoberipig.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/ruzaganog/instrumentation_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/lerod.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/luxacion_de_la_articulacion_del_hombro.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/64777115199.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/54781929860.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/jazetewokadobapowavo.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/ratexovalobekow.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/lejomotanumemib.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_off0000d1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D7 5500 bytes
SHA-256: 73cae9f22ec741cf566ec7b36968d7f841c67efc7bbc04a015665dae08a61c9e
font_01_sfnt_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 10108 bytes
SHA-256: 1cc69c8121f4758ce0431ccf1d417c753b4ceea34583bfd1937ef58f2232a2db
font_02_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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