Malicious PDF — malware analysis report

Static analysis result for SHA-256 25808de10b7cd9a0…

MALICIOUS

PDF

101.0 KB Created: 2021-04-19 11:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 194b10d4e2e096a5ee35a847372ae01c SHA-1: 2d3e622c6f1dddbf3bb25e72e6daf884a229edf0 SHA-256: 25808de10b7cd9a0d271c2b781262a2e6988790dea4c4b070dc4ae8cb29bfef0
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which, 'https://jacksth.ru/strik?utm_term=a+discovery+of+witches+season+2+release+date+us', is flagged as suspicious and likely leads to a phishing or malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=a+discovery+of+witches+season+2+release+date+us PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413975/normal_604bc997561b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5fe4c8583dce9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_60373cd068f6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_606544b089f6f.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/33298389039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_605abfff073ba.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/how_to_put_together_a_craftsman_shop_vac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigezenefibi.epizy.com/assistive_touch_iphone_4.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_2d1ba013f1584fe089fba8cd2beaaa9c.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_a07468d933674632a6159f40942e8375.pdf?index=trueIn PDF document text
    • http://wowutuzineko.myartsonline.com/why_does_my_mr_heater_keep_shutting_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d93192b-bd9d-4187-b081-217d7aca7500/88685858968.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/dorian_gray_2009_full_movie_online_free.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_594e08392ea344849d280ed4ff336299.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/ruzimogixoxiwodezoseragi.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/how_to_transcendental_meditation_technique_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/63280564425.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/woropesadiwelanenefog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42bbe592-30f1-4e98-99cd-0aafbba6ebe1/how_to_analyse_image.pdfIn PDF document text
    • https://5fb3b2f4-e86d-4029-b823-ac5950ddf4c1.filesusr.com/ugd/c0aa49_9b35689a63d14114a3774f07d72cdf1a.pdf?index=trueIn PDF document text
    • http://zovopabipani.rf.gd/greater_than_less_than_equal_fraction_worksheets.pdfIn PDF document text
    • http://fodudedokuka.rf.gd/panel_data_analysis.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_a647534d6ca045c190d2e528861f8056.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/robalijipirelewugu.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_off00014cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEC 5484 bytes
SHA-256: 6ff2b60693d4d2e2274ab57059ddb64d396d5de5c484b085ed2e2ac00e265f37
font_01_sfnt_off00015fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAD 11440 bytes
SHA-256: 81fe6f1148f8f357a311bc158a3df14cbed3746bcd5e729ba30f1c148c2a2777