Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de5935d99d65768…

MALICIOUS

PDF

69.2 KB Created: 2020-11-18 02:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ea2772d9c84b9ed8db13eeae6a641ad4 SHA-1: d74df1769b523ed409b97f6503eaf31966a12a2e SHA-256: 0de5935d99d657682cc7d421c222988653f404b5bbbef2caee15620a5b48b114
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'mining guide'. The presence of multiple PDF links and a critical heuristic firing for a malicious redirector strongly indicates an attempt to lead users to malicious infrastructure. No scripts were extracted, but the PDF structure and link farm heuristics point towards a phishing or malware distribution campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=mining+guide+osrs+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f91d712c1830.pdfIn PDF document text
    • https://subegudikowezi.weebly.com/uploads/1/3/4/4/134476363/2864151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5f926430e816d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5f943715a944c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_5fa8efb7e97c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_5faa36934f801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426823/normal_5f9f753b85156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_5fa29d051733d.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/latufenaw/niguvinulibibilipelidumul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bcb3b74-cb84-4f21-a369-119007b34530/lekewarifutarazarid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d87e122-88d7-42eb-bb6e-b35262f1a9ec/terrible_things_in_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/rogifewuredulo.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/playstation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/jezefewezosazu.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/to_a_waterfowl_analysis.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_off0000d10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10C 5276 bytes
SHA-256: 0603db222d6d576175195a7d44e8d9b556a3565931cf62800f99cc29ea62f02e
font_01_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 11028 bytes
SHA-256: bc752bb4ca1100f8acb22b74ba47e415a07404f3a67348aff6284b852b764dcd

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