Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcf6006d9fb7610…

MALICIOUS

PDF

70.9 KB Created: 2021-02-10 17:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3cc4c0a1fa268fe9b6b40e6da060406a SHA-1: 2cb8b76136fcd22ad35c6842cf2395c1cd4ad672 SHA-256: 7fcf6006d9fb7610f580f93eb67b5c7460477d046c734800522e88e79b6d120a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to direct users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest a malicious intent to redirect users. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=champion%20song%20%20bravo PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413966/normal_60089a8a006c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_5fd1be324835d.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/gafuguzosiv.pdfIn PDF document text
    • https://jizidetaji.weebly.com/uploads/1/3/4/6/134626841/357c379a35.pdfIn PDF document text
    • https://pumejikugo.weebly.com/uploads/1/3/0/9/130969330/pujanarezidik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_5fd27e4678c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_5fdbac3b6a52e.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/wivufol-netixagafu-gitokinelezu-migekituxokar.pdfIn PDF document text
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/redidawuneza-zojekaxenones-lokotexoku-vifotujuf.pdfIn PDF document text
    • http://anrostore.ru/jupiter_japan_income_fund_fact_sheeto4q61.pdfIn PDF document text
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/1728355.pdfIn PDF document text
    • http://reduslim-italia.website/94640036120yzzcb.pdfIn PDF document text
    • http://dream-stat.ru/wopesozalikobol6ir1.pdfIn PDF document text
    • http://betmoy56.com/22216291597sizvy.pdfIn PDF document text
    • https://vusuranozaxo.weebly.com/uploads/1/3/4/0/134012668/jateloda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fca83426f632.pdfIn PDF document text
    • http://liko-sneakers.com/85870484527ae3z0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504554/normal_5fef3502776aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 5308 bytes
SHA-256: 549498b1d98da0498c438fdeca34edc30394a989a9a7d8618bc7434032c7691e
font_01_sfnt_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 4884 bytes
SHA-256: b727e2f3e8e0a5e7aba2ee217344cfdd38eafa8c2eaebbd9986a9e66215a6aa0
font_02_sfnt_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 10912 bytes
SHA-256: cf6cca02d78bfb1e8c317c405667ee51ae5871b686120408ac002b8a48c18e5c

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