Malicious PDF — malware analysis report

Static analysis result for SHA-256 520d3d43da6121fe…

MALICIOUS

PDF

66.8 KB Created: 2020-12-20 04:35:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 50ccf2cfc5dd93076298c21c1d23b957 SHA-1: 80cca2bf71951c8faa9a5761bf3bb56a6c2c9873 SHA-256: 520d3d43da6121fed63588d85964a3fc3594e52de90b9ad023bd8f0fc8eef947
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content, possibly for credential harvesting or malware distribution.

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://traffset.ru/strik?utm_term=for+each+ratio+select+the+building+block PDF link annotation
    • https://pikofejuja.weebly.com/uploads/1/3/4/4/134478885/gimakujunazi-xixuzi-zunif-divegemir.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/bewobabotidigeb_tunenijidivazuf_matafeme_tipisiditenevaw.pdfIn PDF document text
    • https://xenifopiri.weebly.com/uploads/1/3/4/5/134507673/ponufudur-mudigozikiru-gasimudiwetujed.pdfIn PDF document text
    • https://pimelotug.weebly.com/uploads/1/3/4/5/134576353/falifo_kilimuvoxoki_farugizi_sipemo.pdfIn PDF document text
    • https://kujarubokaja.weebly.com/uploads/1/3/4/5/134590089/gubaviwidepe.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/lixajozakuzaxel.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/mowukadidini.pdfIn PDF document text
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/6221624.pdfIn PDF document text
    • https://jumirusuvowelu.weebly.com/uploads/1/3/4/6/134632856/rilovewal_wowegebakivadaj_feruvikemipofe_bazigigotuki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc54ea3b8467722f1f10cc0/t/5fce18890ab5d62feb1a5b02/1607342224856/musica_italiana_2020_estate.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b0708651a04751998254/t/5fd734c0e5ac5828963c772e/1607939265302/563623999.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c3421c8c741314533f60/t/5fd72ceed654060362e1f3b9/1607937263218/70761878741.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/sotoniremujimelitopase.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_off0000c642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC642 5360 bytes
SHA-256: 64c1b420203e502ecd1821af4d0f4c2266170042ccc67b83d3e8a8690bcb9f83
font_01_sfnt_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 11152 bytes
SHA-256: a3e2acf365151ae19fb13fd645c889325488b3f3160231f0523e7d5db849974e

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