Malicious PDF — malware analysis report

Static analysis result for SHA-256 32436f4f12019f9a…

MALICIOUS

PDF

89.2 KB Created: 2021-04-04 08:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f9b6130450b62e22bd94ef9e34b31a82 SHA-1: b36ee47d651badcf1e014c85dee2936ed4a8226c SHA-256: 32436f4f12019f9ae44da3771e78342f05477b19d323b4d967c7ca62d1250e47
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=highway+safety+act+1966 PDF link annotation
    • https://cdn.sqhk.co/rivogigaweb/63QpVZj/xorodegewale.pdfIn PDF document text
    • http://romigeguwapefi.22web.org/tamil_nadu_registration_guideline_value_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_602282603665b.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/eibbybS/zobavuwogim.pdfIn PDF document text
    • https://wevabubuked.weebly.com/uploads/1/3/4/5/134584052/5435672.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/vudoguzob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_6033001645582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_6038d59e89203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_604a04588307f.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisoritet/iterVhf/zurugirosibep.pdfIn PDF document text
    • https://cdn.sqhk.co/gozajare/ifieQ2y/papegugal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fd612f955de4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_5fd2019b60769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_6054183d61888.pdfIn PDF document text
    • http://juwolopuga.66ghz.com/panel_solar_casero_proyecto_escolar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408997/normal_6009624fb454c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449192/normal_5fdc24a6d2a94.pdfIn PDF document text
    • http://jazejoravasog.22web.org/vemet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://saponasikaxugab.epizy.com/55803119492.pdfIn PDF document text
    • http://wizuxamop.rf.gd/30781637897.pdfIn PDF document text
    • http://bozetuv.rf.gd/kukilagiwijokopibusene.pdfIn PDF document text
    • http://wijobave.epizy.com/zufexawofunukate.pdfIn PDF document text
    • http://todogeduwogowev.epizy.com/74548484954.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 5104 bytes
SHA-256: 03da88de55d59e75e35b436bc3ae0dbb51987f2a76712416be2e37e03c830ef4
font_01_sfnt_off000122fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 11184 bytes
SHA-256: d3a7d51e65ddd577e6d5f3e56bddccd19ff3794194a536bae687c6024a48f795
font_02_sfnt_off0001493b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e