Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4fdd7db65803c0…

MALICIOUS

PDF

98.5 KB Created: 2020-12-14 04:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ecf301127061fb02c765424753c7547b SHA-1: b94ec8cc3aa94ee70d594a76801d82d057ebceec SHA-256: ff4fdd7db65803c0e9395701d7f55056d3d413f73a30ffd1202fe09a8d0aa857
214 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one identified as a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/aws?utm_term=kingdom+come+deliverance+guide+tips In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_5fb66cca14282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_5fb307c4de066.pdfIn PDF document text
    • https://dudumopovidin.weebly.com/uploads/1/3/4/3/134308156/lizep-nukutizon-tujufidago-norafijen.pdfIn PDF document text
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/4135221.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368998/normal_5fc94a809fcfd.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/xibexo.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/18eeaf87-feb5-4a09-a2b7-cb0aa5f61521/xutejifekativiwimatakozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b15b537-d76b-440d-b93d-8554e615cda7/resident_evil_vendetta_full_movie_eng_dub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6cc608-4a33-47fe-8471-9a3645935d05/pokemon_revolution_online_covet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f195784-75e7-4644-a2ba-ed1982cf2be1/fesipabevumirewas.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/jenitefiribuwelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17835d9-6d60-4f81-a3e7-58e6ed0a53f3/zudajezeredejewi.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_off0001458c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458C 5424 bytes
SHA-256: fa615de69a9ae828404b9820015b01ce052065c20004e40065a23082f70d73d1
font_01_sfnt_off000157f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F9 10720 bytes
SHA-256: b972abd871fa7d628a695872927a836ae55e633c4c57270d0cacf4e5fe9e5af2

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