Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ef7d662393a860…

MALICIOUS

PDF

72.2 KB Created: 2020-12-28 06:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1dbe8db4680c89552c6e5688889d8fc4 SHA-1: 2e6a4581919542ef2a4ce3c148733248b24d577d SHA-256: 41ef7d662393a8600f40cc338cc14032d7d90bb38d5e2a490e4e60be75617344
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or redirector document. It contains a large number of embedded URLs pointing to various disposable hosting sites and a known malicious redirector, suggesting an attempt to distribute malware or phish credentials. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous links strongly suggests a malicious intent to redirect the user to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://ggtraff.ru/strik?utm_term=megan+is+missing+full+movie+free In PDF document text
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/9584269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456663/normal_5fc1b4ef2ec27.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/dozafawegikuxoto.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/wuloxogujot.pdfIn PDF document text
    • https://pomawuro.weebly.com/uploads/1/3/4/3/134368023/sezuvep_mibojefa_masopiv.pdfIn PDF document text
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/5180868.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/c07c788caee5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_5fa5e12f4d84b.pdfIn PDF document text
    • https://vuwawirekexaz.weebly.com/uploads/1/3/0/9/130969699/8c80bce.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/c1739b0f-2962-4e85-8213-fd6245f52099/free_amharic_orthodox_spiritual_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee5008f-4b7e-4a10-b517-0fb4ada8de2e/31270716062.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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 5152 bytes
SHA-256: 620a000bb9aaeac2ac4d5797aa3b1ced9e8cf445ceaa053c116438d34869e42e
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 10904 bytes
SHA-256: 979b615626c697d35f0613cb888c5ce4bbfbd378fdeb3aff3454a843fda9a359

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