Malicious PDF — malware analysis report

Static analysis result for SHA-256 446e6c35d9deb723…

MALICIOUS

PDF

93.2 KB Created: 2020-11-11 15:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8cc097bc4d69a9d5074d93e55047e715 SHA-1: 15cea182f9abc16387a08d70e09831e607bb1495 SHA-256: 446e6c35d9deb723b56159a8fab0b18ff969a3fbe09a86c1223e98c1c4d47dc6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://trafftec.ru/123?utm_term=extended+arguments+philosophy+prezi PDF link annotation
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/kiwinawadana.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/fogobifadezofani.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/dojatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_5faabeb5e3a28.pdfIn PDF document text
    • https://baxojozejaxofo.weebly.com/uploads/1/3/4/5/134586757/2853396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5f9370b803cf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454164/normal_5fa4390563002.pdfIn PDF document text
    • https://xokekomoto.weebly.com/uploads/1/3/4/5/134598663/5611169.pdfIn PDF document text
    • https://pazelofigo.weebly.com/uploads/1/3/4/5/134588761/fukobusoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f88b13b52bf3.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/tejuvonixag/love_stargirl.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_off00012de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE9 5552 bytes
SHA-256: 7c12aead19e49b4031249f6fbf22d1e41e5c963c44b8ec72f9879a88576cd19c
font_01_sfnt_off000140bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BC 11872 bytes
SHA-256: 99165b9a4b255cbabdf241d8fa49cff475726c13cbc2fe87bb0c075655d7cc81

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