Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc706c6b1fe4da80…

MALICIOUS

PDF

76.6 KB Created: 2021-05-15 22:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 05ed53b4d3dbc64467ffc0830bba5057 SHA-1: 0e03702b779a7f42066a16a16eceee75a418a1ed SHA-256: dc706c6b1fe4da806eb0ce760b538a13ac76f772823c51a23b1b23aa622f3ae5
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and appears to contain junk data, but the presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=what+does+the+elephant+symbolize+in+the+story+shooting+an+elephant PDF link annotation
    • http://goldstein.capital/47675516827092qs.pdfIn PDF document text
    • http://lexaxak.mywebcommunity.org/biotic_and_abiotic_factors_of_environment.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/cuenta_conmigo_pelcula_descargar.pdfIn PDF document text
    • http://politach.com/hotsy_pressure_washer_parts_manual18nh6.pdfIn PDF document text
    • http://kedamijofulufep.mygamesonline.org/chemistry_notes_class_10.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/zalejerujanufozawuxer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipebevu.atwebpages.com/effortless_mastery_kenny.pdfIn PDF document text
    • http://nanolato.rf.gd/fawejivup.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_c59289e588324a2fa037dbd3eadb1b28.pdf?index=trueIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_ab23844df8474f419ed5ce09307e2a02.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_a6a6582238214d649d1b5a804bf50984.pdf?index=trueIn PDF document text
    • http://dojafeduzig.myartsonline.com/neato_xv-21_replacement_parts.pdfIn PDF document text
    • https://2e96d104-cacc-4af9-914c-411927af6089.filesusr.com/ugd/0f866b_2b6473ca7aa74e6c9d5c14499dd681e6.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_00cbead511674410be25ddb4ae0d7315.pdf?index=trueIn PDF document text
    • http://sovizaz.epizy.com/vocabulary_for_toeic.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_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 5680 bytes
SHA-256: 9f40eb4a33d0c0acce647ee4afa32fc9911495d80918e8675344359e2fe83bd0
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 10728 bytes
SHA-256: 2f128c5799ac29152fcd308ded78ca9880729c2429328d737b4b2b88c9ad6e9a

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