Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af17e73ff22a93b…

MALICIOUS

PDF

78.0 KB Created: 2021-03-12 19:27:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ebcf03fc550a56f4d13b49c787095043 SHA-1: 30ccece3257d2da9c5cd0ef040586f2df07e5342 SHA-256: 2af17e73ff22a93b37317e607b0e9b188f73d18a3485ca289f38dae40c645f1b
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a large external PDF link farm, with one of the primary links pointing to a suspicious domain. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to a malicious site, likely for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=accounting+chapter+11+study+guide+part+2 PDF link annotation
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/dc13318c6d6139b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411717/normal_6008cd4b79f95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_6006be3b672de.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/e90cb7.pdfIn PDF document text
    • https://zesijedoroge.weebly.com/uploads/1/3/4/3/134372038/pivififutol.pdfIn PDF document text
    • https://womukowewefe.weebly.com/uploads/1/3/4/8/134889771/9072348.pdfIn PDF document text
    • https://menanolunum.weebly.com/uploads/1/3/4/7/134754058/dumajozodoru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404987/normal_5fce9a23c2c3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366653/normal_5ff7f2042efc3.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/zemunomipazikez/an_imperial_affliction_a_real_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/buwagubitosenopaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e288dc3-4594-4203-b9c2-7a034ccb674e/80343936932.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/chudiyan_song_likewap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe0a4c6-9b11-4a68-b875-bed919185c64/58191937912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fe9b39-581a-4695-8ae7-54183ca81f5b/taco_bell_soft_taco_no_cheese_nutrition.pdfIn PDF document text
    • http://foxinojale.epizy.com/92102573693.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/46330882081.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/femavugizerigelududug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12d6b6f1-d3e8-450f-8488-d99fa824acf8/vivepovujikubawafatakozi.pdfIn PDF document text
    • http://sekijipaladi.epizy.com/clariant_ag_annual_report_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40f1ce8-a776-40c9-a88c-825a871aa3aa/what_is_exposition_in_plot_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/2692169377.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_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 5576 bytes
SHA-256: 9e78d6ea2ba710a2cd5d748013b57fbb320325876a9515d8fd0d5b49d703fa36
font_01_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 10564 bytes
SHA-256: 9bdf84a26303ee6329d0f497b5c7ad3c1c54f8e11c89f7ca0ebb51d449dbc4cd

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