Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb4f0f3c9a3179f…

MALICIOUS

PDF

79.1 KB Created: 2021-03-11 21:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: ec0b730533aca505d9735fb3f7b84e1a SHA-1: 992b7b4511c34d0acfd895b3953302404eb0e9a3 SHA-256: dfb4f0f3c9a3179f34a77f434725adb298c4031d36320e8136f668db80efe597
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 generated to appear as search results for administrative topics. This technique is commonly used to direct users to phishing sites or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=quest%25C3%25B5es+administra%25C3%25A7%25C3%25A3o+geral+e+p%25C3%25BAblica+pdf PDF link annotation
    • http://topplafond.xyz/what_instrument_measures_air_pressureshf1d.pdfIn PDF document text
    • https://matigolexa.weebly.com/uploads/1/3/2/6/132682665/nitixomo.pdfIn PDF document text
    • http://virona.org/lagu_anak_sekolah_chrisyeh3wsi.pdfIn PDF document text
    • https://kowulenube.weebly.com/uploads/1/3/2/7/132740682/d5cbb4e56d.pdfIn PDF document text
    • https://pisixaxonazav.weebly.com/uploads/1/3/5/3/135394173/wapewiwotideza.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/49427688894.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/34966279121.pdfIn PDF document text
    • http://kigurumi.org/fender_frontman_212r_weightguy52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_ebfc339eec0e4caab472f536c2681138.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woneketelak/kinoromuliwexokeriteko.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/different_forms_of_energy_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/themeforest_email_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/final_fantasy_lightning_returns_trophy_guide.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_e6966e70cb4e4281b070b727fbc97b13.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_959b23cd7c6f49ba87b92cc1d7129397.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luxelula/94967832926.pdfIn PDF document text
    • http://dufobirufo.atwebpages.com/why_does_my_moped_not_start.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/fixis.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/carruthers_organic_chemistry_free.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_477ee044b1024ca9925dc79b442552ee.pdf?index=trueIn 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_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 6508 bytes
SHA-256: 9549c01dc0cd09082dc6af47efdf8dcb03787bbc260b19a046d2207a4c1817cd
font_01_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 12636 bytes
SHA-256: 2bbf065ac144007fe4545521a64c876e8cd7ae53a11a2fa548613cb2df577f20

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