Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bbb68137db4629…

MALICIOUS

PDF

64.5 KB Created: 2021-02-15 17:03:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a0add6dce3109dcc1a0f44f523499ab9 SHA-1: 6f2d569eecda461fdc4403f20eacc703807a2ba4 SHA-256: d8bbb68137db462930f954738e12c09b2d3b14a463c3df3978ce46e8d7c69e3f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The document body, though heavily obfuscated, contains strings related to 'Washington post weather gang twitter' and the authoring application 'wkhtmltopdf', suggesting a lure to potentially malicious content or phishing sites.

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 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://druttle.ru/123?utm_term=washington+post+weather+gang+twitter PDF link annotation
    • http://mamontov-net.cc/business_sale_and_purchase_agreement_form_nzwg09i.pdfIn PDF document text
    • http://wide-do.top/adobe_flash_player_latest_apk_free05vew.pdfIn PDF document text
    • https://vafobuzegigotot.weebly.com/uploads/1/3/0/7/130775214/bovizezizefilupudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373504/normal_5fee52835ca4f.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/5058209.pdfIn PDF document text
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/96560.pdfIn PDF document text
    • http://itsamorem.com/gopazalibusajanobejujakuki4ei.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_600ba512d4ea2.pdfIn PDF document text
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/195125d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_601d7fd1c1373.pdfIn PDF document text
    • https://banetopebored.weebly.com/uploads/1/3/4/8/134874573/zetefir.pdfIn PDF document text
    • https://zigakenipipoto.weebly.com/uploads/1/3/4/1/134131781/729f1596906e48.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/15ae5c66d3691.pdfIn PDF document text
    • http://dazenad.iblogger.org/california_investigative_consumer_reporting_agencies_act.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/7b6a4e0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xatofuli.rf.gd/fractura_hueso_cuneiforme_medial.pdfIn PDF document text
    • http://dejomogilum.rf.gd/bagrrys_company_information.pdfIn PDF document text
    • http://bakofenomuzinu.rf.gd/bindingsource_c_windows_forms.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_off0000c072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC072 5152 bytes
SHA-256: 66f0c1e3d93f6b853691534698e095efa5747420044a51401d5c15cfeffaa272
font_01_sfnt_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 11472 bytes
SHA-256: 179409a44339b636900bba173c1ce89c39014a079a6e3ca96d76e81b7ce08c8e

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