Malicious PDF — malware analysis report

Static analysis result for SHA-256 43254770783ef372…

MALICIOUS

PDF

71.3 KB Created: 2020-12-08 00:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1fb0bb2f948075b7ffc9d706b2c92a46 SHA-1: 1de214f9ed5909055a23a50ef0902fb9e964aa79 SHA-256: 43254770783ef372cd3afb7fd3622555c91602d86e66cf549fed180e87213c04
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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://trafffi.ru/123?utm_term=1999+miata+manual+transmission+fluid PDF link annotation
    • https://menaxogem.weebly.com/uploads/1/3/4/4/134432074/xafigikapetaguz-ratodinesi-pomoka.pdfIn PDF document text
    • https://tibaxefuxi.weebly.com/uploads/1/3/4/0/134017075/49d3a52.pdfIn PDF document text
    • https://vowimusu.weebly.com/uploads/1/3/4/6/134655535/9f0a65cd1732fc.pdfIn PDF document text
    • https://tedojumutu.weebly.com/uploads/1/3/4/0/134042579/wavize.pdfIn PDF document text
    • https://gobuxasab.weebly.com/uploads/1/3/4/6/134608876/2380272.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://uploads.strikinglycdn.com/files/7200aede-0b27-4c4d-ae7b-ff8e986266f7/95809782280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e7cae7-399f-4712-a817-d4a1442d0488/1._how_do_paleontologists_learn_about_evolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c006db4-5e65-4992-be35-11e6019d1799/summer_of_director_oh_2016_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae769efb-f15d-4ebf-8abb-278a27cc0ab7/93377091073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d0e327-6797-4f9c-91e6-ec0dac2a550d/sofimurudaxaduselib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b30102-2ce2-4b65-ab9d-45ab508b9b33/mebosekejasutijutubixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e042f104-2937-46ce-a476-0ccb32cf2c19/zowigosatijoxegaxor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e9a48b-51f7-4ffe-995d-d443bffef9b6/11453296789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3147fd39-5b1b-4333-a48c-fe9018fa92b6/javenirirelatuvuberek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a753a9b9-6bea-4e51-b7df-f7a3dcb53e65/67759701864.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_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 4932 bytes
SHA-256: 03538acbde21fcb76e8f6dc38212ff193410b4f5c71fdf28d5d49300dd90964a
font_01_sfnt_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 10156 bytes
SHA-256: 82b81ea497d96907971768bc2c6f800f44d9b96ac9b6baa3e6463f09d4b4186c
font_02_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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