Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3a229f496738cf…

MALICIOUS

PDF

84.0 KB Created: 2020-12-08 20:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4da3848a43aeb3c9b086bb7a8b731336 SHA-1: dcec88304bb831c617eecc9782926a8c13fba90f SHA-256: db3a229f496738cf78e8ec1832abf1c4da6280f5b1b31bb91843fd721658dc63
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to obscure domains and appear to be part of a link farm or SEO manipulation scheme. ClamAV and ML classifiers indicate maliciousness, specifically flagging it as a phishing or trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=what+is+a+thallus+in+fungi PDF link annotation
    • https://tevuvusit.weebly.com/uploads/1/3/4/3/134373155/jusixuvag_volimizepi_febitejewi.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/gexipesivus-zaxawigibixaluz-wadasat.pdfIn PDF document text
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/1802262.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/kexuseludaliluv_zovuzadelet_demavumadiku.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/5fbce344be7cfc36344e8aaf/t/5fbd0ec868bfc518616a5991/1606225608573/32992474914.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5bf2cc6229360ecce154d/t/5fce31340ab5d62feb1d1b9e/1607348534253/household_chores_list_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a09647-d321-48eb-8aaa-705c84907874/graphic_designer_portfolio_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1baba2cf09257bd71d527/t/5fc69a4e08845d092472d38d/1606851150939/parler_word_in_french.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/9409114417.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53afda3bf4b14abc57bb9/t/5fc83efb6031f4738618ad49/1606958844310/vugovogavasorit.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffa571c8c7413142c9acf/t/5fcb71dc8dcc5603bef402e2/1607168477343/14779493873.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc534b727a199023ad18a8a/t/5fc5e1146457125654077a9e/1606803732525/el_rey_arturo_pelicula.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f5bd11f6a4198485fb86/t/5fce6f5ba00b1a6cbeb0af52/1607364443317/mine_mob_clicker_rpg.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_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 4948 bytes
SHA-256: 7595b802c13602f66f1700cba60be1acd19a1b0129756f469871a1600346f9f5
font_01_sfnt_off000117e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 13884 bytes
SHA-256: 14cc07c7eabe2c1702c03dff474c7c9a6063100f2ca5531125c9b88eee99841f

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