Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a06f8cb1d145f3…

MALICIOUS

PDF

81.8 KB Created: 2021-03-25 11:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 009de8e2e95f002f20baf736f40b2f1a SHA-1: 48aeba2b62a195a847a76f6cc4c3d39c6edb70de SHA-256: 72a06f8cb1d145f31d1110b508dc55871d33fca34ee7aeb640c2ef47e6fe8aef
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm designed to obscure malicious intent. The ML classifier and ClamAV detection strongly suggest malicious content, likely a phishing or trojan payload delivered via these links. The presence of embedded URLs and the overall structure point towards a phishing attack disguised as a free book download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/award?keyword=fiction+books+to+read+free+download+pdf PDF link annotation
    • http://dojemop.mywebcommunity.org/resistance_band_back_exercises_no_anchor.pdfIn PDF document text
    • http://vavazexowupex.medianewsonline.com/audible_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/HFie3gI/81685780650.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/printable_calendar_2020_july.pdfIn PDF document text
    • http://wisemad.22web.org/37221009505.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/hjGegnc/witobilevuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sijaxulo.rf.gd/ceptam_9_syllabus.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_0b7f82948bee46ab9ae7e99fb47b5406.pdf?index=trueIn PDF document text
    • http://bejitepirisobi.epizy.com/16186941744.pdfIn PDF document text
    • http://wamulax.epizy.com/companion_planting_chart_uk.pdfIn PDF document text
    • http://jiwepatifon.rf.gd/gestational_diabetes_treatment_guidelines_2015.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/one_of_us_is_lying_summary_chapter_20.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_84b6d79d271643899c11019769bfdab7.pdf?index=trueIn PDF document text
    • http://xulezudo.epizy.com/moguvepewati.pdfIn PDF document text
    • http://merapenerabari.myartsonline.com/cultivo_de_cebolla_china.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_d37d5b440c5d42949dd7768170e8ea5b.pdf?index=trueIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_56306d035b374c2e96624be1ffc74113.pdf?index=trueIn PDF document text
    • http://pevurevakube.rf.gd/53923988443.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_dd2b1054779c4ec4a9546ef0f1e083c2.pdf?index=trueIn PDF document text
    • https://13dbc848-c95e-4197-a439-3ae2050b6ee2.filesusr.com/ugd/46bbe5_1f4ec6773071447b9786bc4364e588c9.pdf?index=trueIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_a4b56aab2ebd4c40a772595bdc2ce171.pdf?index=trueIn PDF document text
    • http://lakivexa.epizy.com/titan_annual_report_2020_19.pdfIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_1767137297384cd39e7adb7858a2fa58.pdf?index=trueIn PDF document text
    • http://tegumebedizeso.epizy.com/javascript_tostring_format_number_leading_zeros.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_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 5400 bytes
SHA-256: c6213e02fc7925b4e8cdaca2792be3419d31c36766e44e267b864b02f25e6176
font_01_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 10588 bytes
SHA-256: 163e236dd6f86950d3d7612c20c29f5da133d680e6294fca2bc7112ae9966c63