Malicious PDF — malware analysis report

Static analysis result for SHA-256 d150f85c0ce8bf32…

MALICIOUS

PDF

73.2 KB Created: 2021-04-02 17:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0878e5f4682728620661eb18d5e140d SHA-1: 0324dacfef5df0d7e596c91bc2ad3f4be539a6ad SHA-256: d150f85c0ce8bf32ec359d7c30e1e4e13c8bcbfb5a6b5d811c287a1e3bb7f220
156 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. It contains numerous external links, including one to 'soxebez.ru', suggesting it's part of a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure for an 'employee absent from work form', a common pretext for social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=employee+absent+from+work+form
    • http://nunesop.scienceontheweb.net/antologias_upn_plan_94.pdf
    • http://xegisepereti.mygamesonline.org/cambridge_movers_practice_test.pdf
    • https://cdn-cms.f-static.net/uploads/4388815/normal_604424da1b579.pdf
    • https://static.s123-cdn-static.com/uploads/4376101/normal_6004ebf68f0b0.pdf
    • https://tumunonapuve.weebly.com/uploads/1/3/1/3/131379134/lusalodonukigod.pdf
    • http://guzoseta.getenjoyment.net/alimentos_bociogenos_e_hipotiroidismo.pdf
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/2398388.pdf
    • http://jaxagogilexet.sportsontheweb.net/can_i_use_max_buzz_without_a_sponsor.pdf
    • https://static.s123-cdn-static.com/uploads/4415546/normal_60015f59677af.pdf
    • http://govuxojikasumot.scienceontheweb.net/givoxagunavimatex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nejarisiwudu.atwebpages.com/golozonigegib.pdf
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_7b1eb1b224bc4975865fefee8c60ce4e.pdf?index=true
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_749ba16d7cfc4b4c9d95e563fb53b703.pdf?index=true
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_43c14166df0946009e27b445d3f11b23.pdf?index=true
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_9dee4a19395b4462b98bae2354d561af.pdf?index=true
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_d7ab96a271d840c493bc1787e9063267.pdf?index=true
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_088d5f295f334be4a9a6e5e69c5f6b30.pdf?index=true
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_18dbb010fd684eaf8e7a49e61ec1f008.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df17.bin
224aab4e41b1d144821ce07a70847f7dca75659051c68d620a887608262cacdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 5400 bytes
font_01_sfnt_off0000f17a.bin
2f371571d18bbb5a276f1b5b0702ba45e78c0b410b2f9cf900d46d74e0a19d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 10752 bytes

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