Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bf96919b3c5962…

MALICIOUS

PDF

80.3 KB Created: 2021-03-19 05:58:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 50b78bdc13d9b6eeab3a20734be0d279 SHA-1: b85830360d0faacad1b770fdc00b9b44e4f740f2 SHA-256: 19bf96919b3c5962363230d0ff07143faf985f989963c0958bb0da8a98127892
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=factorizacion+de+binomios+ejercicios+resueltos PDF link annotation
    • https://cdn.sqhk.co/gobisofokox/jihbhjr/97295618074.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/23050668442m4621.pdfIn PDF document text
    • http://hopecommunitynaz.com/chennai_district_mapg3bvo.pdfIn PDF document text
    • https://melazikadoxu.weebly.com/uploads/1/3/4/5/134594637/5c4cb354a3b1224.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/ihezRjh/fireman_sam_jupiter_toys_characters.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/steam_remote_stuck_at_0.pdfIn PDF document text
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/lazutarukuju_tefajir_tetujoleke_sudenije.pdfIn PDF document text
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/fevawadomup.pdfIn PDF document text
    • https://nunezujotegu.weebly.com/uploads/1/3/4/3/134312528/batakuxepoge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_ee4a45c49f674f25be66dce566db5a53.pdf?index=trueIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_c931b7e6be6947239b7eda0d8ad7f55c.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_23a815b6c68047ef9c4686df40f8e1e1.pdf?index=trueIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_20630071efae4b3a9b783d22fe6fd34a.pdf?index=trueIn PDF document text
    • http://sosebumi.epizy.com/ford_windstar_2003_manual.pdfIn PDF document text
    • http://vedidutumi.rf.gd/whatsapp_voice_call_app.pdfIn PDF document text
    • http://rozofamano.epizy.com/student_profile_page_template_bootstrap.pdfIn PDF document text
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_4adce4d6ca194e7b85de040893758aec.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 5308 bytes
SHA-256: c951ddb4f062ef11edc8df4f84aff8c84caeb0e6694a65d6536c781fdf4a88c6
font_01_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 12712 bytes
SHA-256: 268bad85d8d42c12e80f06cba04cac3907e7a6b0350d3f9fba0327a99260b30e
font_02_sfnt_off00011cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF8 16088 bytes
SHA-256: ccf42771811f3bfcfc4881e0ea26c61020463520b77f542a172ed5d532e4d210

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