Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f9547080d18f80…

MALICIOUS

PDF

77.3 KB Created: 2021-03-18 08:28:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2727da34697a57a80d0c87611363e600 SHA-1: 25568a85f553c6da17e600486ee641de75943337 SHA-256: 23f9547080d18f80a793e38a66281bbef9be10242b9f2f2d8d056c4af7c2e7db
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or trojan activity. The document body, though corrupted, contains text related to changing phone ringtones, which serves as a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://dafemum.ru/strik?utm_term=how+to+change+the+ringtone+on+my+phone PDF link annotation
    • https://fiwitoritare.weebly.com/uploads/1/3/4/5/134582968/pinusidodiji.pdfIn PDF document text
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/fagafujarigulimewozo.pdfIn PDF document text
    • https://pupiwukonavi.weebly.com/uploads/1/3/2/6/132682553/6746540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_60175952b7da6.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/igjhbE9/htc_weather_app_for_iphone.pdfIn PDF document text
    • http://saudiautoinsurance.com/boxing_star_1._7_2_mod_apkkhqp5.pdfIn PDF document text
    • https://cdn.sqhk.co/gixaxukejamu/giyhhgg/nebigejo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418570/normal_5fec0384bd0d0.pdfIn PDF document text
    • http://kyponnik.online/befozopuxokobozajugjfkn.pdfIn PDF document text
    • https://cdn.sqhk.co/vuguvorexi/jbha8el/pinball_space_adventure.pdfIn PDF document text
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/6036487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_603854e9cd827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458124/normal_5fec4d9ee04aa.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/eUhgzih/blockposter_kleurplaat_zomer.pdfIn PDF document text
    • https://fegesimi.weebly.com/uploads/1/3/5/3/135341766/e08334ac90ae2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorasatijede.rf.gd/attitudes_and_motivation_in_second_language_learning.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_b39fe31bffa94a83a1d89d429d880586.pdf?index=trueIn PDF document text
    • http://komopojanali.rf.gd/batupojekamosome.pdfIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_a12d5f7875b247628b0c72c56c1347e9.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_3c37c251b5264514ba978c22a1e358c1.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_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 5292 bytes
SHA-256: e5e0e4e17530d8640a38c0935c56a51f4e3ac844c6314c4af4bb645b98201d43
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 10848 bytes
SHA-256: 1d47dce6292af9b20d3ef733a6daa04ca4bed7b091ceb98d5fe30840118ae94e

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