Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd55cbf7bc12d32…

MALICIOUS

PDF

74.2 KB Created: 2021-02-17 01:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 874d948615b2997ba85845835bba4566 SHA-1: 4dbd1bcf3bdd64f8fda3118c27d84804c56f95ec SHA-256: 1bd55cbf7bc12d321a653a7642ff42f26599d7bfedd166922b530f8db1544b89
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The presence of a specific search term in one of the URLs suggests a phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, likely to lead users to phishing sites or further malware downloads.

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://maypoin.ru/strik?utm_term=anker+keyboard+bluetooth+pairing PDF link annotation
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/nugavenor.pdfIn PDF document text
    • http://good-production18.site/98369168443fd8se.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404755/normal_5fe4354f3137b.pdfIn PDF document text
    • https://biravozoso.weebly.com/uploads/1/3/4/4/134400929/917549eed8c9b3a.pdfIn PDF document text
    • https://muxuxinipizo.weebly.com/uploads/1/3/1/6/131637853/cd3df5.pdfIn PDF document text
    • https://silujufadusume.weebly.com/uploads/1/3/1/1/131164496/8639467.pdfIn PDF document text
    • https://potepivogatofef.weebly.com/uploads/1/3/2/7/132740463/8907705.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/nilepozu-jimilavugafepud-sixemilonolita.pdfIn PDF document text
    • https://memuvarava.weebly.com/uploads/1/3/1/3/131384606/3694143.pdfIn PDF document text
    • https://vafiradas.weebly.com/uploads/1/3/3/9/133988778/2174d45f4cb9.pdfIn PDF document text
    • http://adminhalil.com/mometez8cds.pdfIn PDF document text
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/ditonokoserofazisus.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/rowimedisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojaxenutu.rf.gd/10964521451.pdfIn PDF document text
    • http://zexizel.epizy.com/bofutamunu.pdfIn PDF document text
    • http://jugikan.epizy.com/listening_test_1_crime_report_form_answers.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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 5340 bytes
SHA-256: 6c4141af70ecb7caf4f6676c5f1fbacc5221f8301eab4d7d21e2ca7db01f059a
font_01_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 10740 bytes
SHA-256: 013861497b5175b3d3084e6b01cf859ebaedb3bd85a473a4c1ff3ec438426c29

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