Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb811dfc4527a34…

MALICIOUS

PDF

127.7 KB Created: 2021-03-20 22:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 454baab495dfdb903c830b176cd30b01 SHA-1: 46f688f878f96305f5552d5c2fa4071a3af787de SHA-256: dcb811dfc4527a34e83e85339cd333da625b99fa646f27fb8c1609e78e2054f3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL and the nature of the links suggest an attempt to redirect users to malicious sites or download further malware, likely as part of a phishing campaign.

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://maypoin.ru/award?keyword=princ%25C3%25ADpios+de+qu%25C3%25ADmica+atkins+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484114/normal_5fde37d55c638.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fce30b4c7816.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530429/normal_5fe4876054f25.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/RSk2jau/xatufaxazaxelux.pdfIn PDF document text
    • http://in-step.shop/77412286984rwa45.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/gjgcjfk/pipupepugisufetimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_602292bdce3b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5ffa3c427bde6.pdfIn PDF document text
    • https://cdn.sqhk.co/wekonexiw/jdjgYBJ/space_shuttle_launch_live_cam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_ec04cfb5fa8242cba4f9a2943def8cf6.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_394c4abf1a7145b6a104eb65a457f189.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/28158821213.pdfIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_c4ece43498304de6800986b3a51cd5e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/2_step_equations_worksheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/10877026466.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_1f6e0e76fc814f92bc7ceab60e988b2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/80067717456.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_off0001acfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACFE 5636 bytes
SHA-256: 7c8a233645d6f3aeeac60c6df18c6bd5f9be9ac43730e06d0cd65552a3cfd0b0
font_01_sfnt_off0001c02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C02D 15656 bytes
SHA-256: 9fc15390a037167506244e6bbe881ae10f1679bbc3f08253597742c82a10e14f

Open this report in the interactive analyzer, or submit your own file for analysis.