Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f7be56b69f7b25…

MALICIOUS

PDF

63.7 KB Created: 2020-11-25 18:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4b0dd1e9afae8f11d4b465b166bf2fa3 SHA-1: 05641156c3fa19ba67241b63f1168c1ecf2fee3b SHA-256: 26f7be56b69f7b25d70e61427b057c08547287ac85dc9604777583c58f44adcf
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including a critical finding of a link to known malicious redirector infrastructure at `https://traffine.ru/strik?utm_term=no+fear+shakespeare+twelfth+night+pdf`. The PDF also functions as a link farm, with many links pointing to disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were directly extracted, the nature of the embedded links and the overall structure strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/strik?utm_term=no+fear+shakespeare+twelfth+night+pdf In PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/sixukejomiwewanage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_5fa6155284d45.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/4b61554ac7f9.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/junuvuguvatodova.pdfIn PDF document text
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/rewir.pdfIn PDF document text
    • https://dadixuva.weebly.com/uploads/1/3/4/0/134018012/noresuji.pdfIn PDF document text
    • https://vizakadaji.weebly.com/uploads/1/3/4/4/134491897/rivita-zasepafe-kugifigawal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce7d7752-c835-463a-95d8-b748767e4e1a/balanceo_de_lineas_de_produccion_lib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4d7abb-300e-48e6-9355-ddfeaf135656/32322408497.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/zanina.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/musizog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c09f2a-917f-4c0a-b255-d2f85db65787/13554337779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37171ec-70d2-4c01-a356-6f348e986d54/minapusemavatusosumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e0d98b-1f2c-4c65-9c6d-b0119cecfe01/zogow.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_off0000bbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDF 5428 bytes
SHA-256: 99686a391cca4129c67bc08429e8a73cdcaa77e037d9cb0c87461ad7f00fc97d
font_01_sfnt_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 10296 bytes
SHA-256: 5925fa0b1d2edde270412c734320f5c600ca97db7b7a02b328e347677fdb82f2

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