Malicious PDF — malware analysis report

Static analysis result for SHA-256 96733ee7f4bcc037…

MALICIOUS

PDF

72.8 KB Created: 2021-02-11 09:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 35dafb07f892e929d07782743d25da65 SHA-1: 76f6aaa27cbee92e10063789f4876cfe7d6dc1c7 SHA-256: 96733ee7f4bcc037795ef0650bbeffc989b36f97acc5e14177b96ab1bd5c7517
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on suspicious domains or are part of a link farm, indicating a likely phishing or SEO abuse attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/aws?utm_term=key+informant+interview+report PDF link annotation
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/boviwojiduxis.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/24d585e5.pdfIn PDF document text
    • http://dithetsen.xyz/ionic_bonding_reactions_worksheet_answer_keympt6r.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/8887838.pdfIn PDF document text
    • https://gipebikurowa.weebly.com/uploads/1/3/4/0/134095939/2217716.pdfIn PDF document text
    • https://rakiletapaleta.weebly.com/uploads/1/3/1/8/131856645/4241147.pdfIn PDF document text
    • https://lowonuve.weebly.com/uploads/1/3/4/5/134584544/gofizejupuvubobek.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/dotivaf/14199425295.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/fhwa_report_bridge_deck_drainage_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/bupujuligaxuvoropakuren.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/bohemian_rhapsody_sheet_music_alto_sax.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/auto_clicker_apk_no_root_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/63486916771.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/document_control_template_access.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_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 5060 bytes
SHA-256: ae1ad2180d72efbba06dba824f2a2b3b1951d4e7b1764af2acb9eea7b3322d0d
font_01_sfnt_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 10500 bytes
SHA-256: 6c54c8c25d3ca756c94390ff0dbf0397b7cd65e9abec36fe1b0c642224630513

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