Malicious PDF — malware analysis report

Static analysis result for SHA-256 0331a8d99e7d92d8…

MALICIOUS

PDF

68.2 KB Created: 2020-12-03 05:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f3a8b87de24570fd77365757c85388a1 SHA-1: 75cfdaf78d5980ab6222ce7ac3e134e47519bc66 SHA-256: 0331a8d99e7d92d8d015bac9db5cfe54eabeec2654e3b593ff1ced274139bb61
156 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 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-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://traffking.ru/123?utm_term=hotmail.com+oturum+a%25C3%25A7 PDF link annotation
    • https://nagilozumovamag.weebly.com/uploads/1/3/4/3/134317868/banidanutiposim.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/13800f.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/maraponirijir.pdfIn PDF document text
    • https://kutebebi.weebly.com/uploads/1/3/4/5/134528954/vimisajo.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/4630219.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/gepiven.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/fofeguj/jewoluxikiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616e9326-2273-4f9d-89d8-7615e3d722d7/95113188686.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/kupoza.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/31442714469.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/ntr_biopic_telugu_movie_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/bill_of_lading_template_alberta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef603cc-9682-4861-a65c-843ec98934a2/yarn_color_chart.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_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 4940 bytes
SHA-256: 96fcf4b05a1d2d90fa0bf03b80c79b91e96fc76c6c9a05c3ebc4fe3c1a9badaf
font_01_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 10468 bytes
SHA-256: 3879f4c67d2f8093e151cc2802aa67795bd9c53a46bf57c37f65e2098de15614

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