Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc147ebf5222c252…

MALICIOUS

PDF

70.3 KB Created: 2021-02-20 00:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8878aee9245c7abde0741c2969e11115 SHA-1: 8bc2320dc82165326257ea88e86ed5e43848f667 SHA-256: fc147ebf5222c252f42cfe7e1e5602de23647e510bc4a001603c696d43b5e66f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or distribution point for malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect users to harmful content.

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://crophysi.ru/123?utm_term=tablas+de+multiplicar+para+colorear+e+imprimir PDF link annotation
    • https://sipexagugiresu.weebly.com/uploads/1/3/4/6/134607427/9a46adab3937.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/2c465edc06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_60183dc952cae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5fff3f22cc9d2.pdfIn PDF document text
    • https://mixifomako.weebly.com/uploads/1/3/1/1/131164472/2678737.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/3c6f6b2143a10.pdfIn PDF document text
    • http://ndfnasg.xyz/49306787610oo2f8.pdfIn PDF document text
    • https://vixozomaregug.weebly.com/uploads/1/3/1/3/131398278/nupowaliluwubot_xogoni_xomefip_jedopaxofibokej.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/820340.pdfIn PDF document text
    • https://wuremude.weebly.com/uploads/1/3/2/8/132815206/6060772.pdfIn PDF document text
    • https://sijerixo.weebly.com/uploads/1/3/4/0/134042725/bepanujewakitipe.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/dufekifaral/avast_antivirus_free_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/amritvani_pagalworld._com.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/96760283375.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/50617271647.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/60642090964.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_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 5308 bytes
SHA-256: 151026089e9d84e1f2c41f835a8a148e82a6750560e2008ccede86fb8548957e
font_01_sfnt_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 11308 bytes
SHA-256: b810bf130fb36475ae08701a3320b4c6fb85999a05f6387204752baf9f4e64cb

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