Malicious PDF — malware analysis report

Static analysis result for SHA-256 2234ff5d64bdb758…

MALICIOUS

PDF

72.4 KB Created: 2020-12-05 05:23:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c73d7e3aaf021fdfbdc66f2d5f472b8b SHA-1: e8149e6444a875a3cd8d5fb3b8b3e61c870a2921 SHA-256: 2234ff5d64bdb7580efe3004188146dfe8b30edf6499eb5b5c745a1f12456d98
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one pointing to 'trafffi.ru', suggests a link farm or redirection tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or SEO-based malicious document.

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/strik?utm_term=prentice+hall+answers+geometry PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375071/normal_5fbf50da44f2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5f8b656f803ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5f8bbdaef2afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_5f8faf1eb11c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_5fa14533a5720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5fa7114d21452.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/motimi.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/vanetigut-jowiv-reralizisovuzox.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/tujesezuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481403/normal_5fb70917c94c8.pdfIn PDF document text
    • https://xokafewapi.weebly.com/uploads/1/3/4/4/134488510/fibefasopu_noxusuxixu_vavox.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/xanebavifamopez/sinonimos_de_premisa.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/kansans_for_life_voters_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/057000a2-6cdc-4069-b18b-a1aec062e6e0/boruwe.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/nasm_books_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3571c6a-4e24-4198-95f8-6da039c3af35/the_call_of_cthulhu_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/92737231576.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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 5408 bytes
SHA-256: 57be9c75694f86880cfc535221d19b1538a1502b94d5497875fd1874d96b9e45
font_01_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 10672 bytes
SHA-256: 34cd3c3cb2a317bbee2fc2516f1f53d6f888150d1e8d2d3e49863da5d0e75fc8

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