Malicious PDF — malware analysis report

Static analysis result for SHA-256 541e0782c1ad01b2…

MALICIOUS

PDF

83.4 KB Created: 2021-04-16 05:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6b217626ab0acf2ebd16e18f348e380f SHA-1: 82b8f40e244b32dcde950d7d9f3ec89926a87e9d SHA-256: 541e0782c1ad01b27075b3f01cf7aaa29328f732caf70577ea8eaf2d962a6047
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

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://mezovuduw.ru/strik?utm_term=what+is+polytropic+head+for+centrifugal+compressors PDF link annotation
    • http://optamorem.com/982810505298q492.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/g7ha09q/8912527786.pdfIn PDF document text
    • http://mafejaruvoje.sportsontheweb.net/xuzuzupazafo.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/ganaluf_fiwabuferib_fupulojebekovux_ginovonomub.pdfIn PDF document text
    • https://wulaludotesi.weebly.com/uploads/1/3/0/9/130969185/a649e12e091.pdfIn PDF document text
    • https://nipifofopofeduv.weebly.com/uploads/1/3/4/3/134338269/feruruwev_jujaxukagafawox_nizawabawuv_pobobuses.pdfIn PDF document text
    • http://yoga-fitness.space/6273907137vo9pt.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/du7idii/last_player_battleground_survival_game_download.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/1791338494658u9.pdfIn PDF document text
    • https://dajitogaxafolix.weebly.com/uploads/1/3/1/1/131164176/2285132.pdfIn PDF document text
    • https://jexiliwole.weebly.com/uploads/1/3/0/7/130739190/4847730.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/miwujokudek.pdfIn PDF document text
    • http://pubgucbayim.com/safety_data_sheet_for_domestos_spray_bleachxdfk2.pdfIn PDF document text
    • http://viwesisikumebi.getenjoyment.net/adaptica_2win.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/mujekox.pdfIn PDF document text
    • http://gopudumimipabol.mypressonline.com/deep_breathing_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/3StKK3e/43570625797.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9b218e-60d9-4058-9148-216df8121a55/poulan_2150_chainsaw_carburetor.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_98d715d3a8ea4fdb9739931541b1b54c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/567ed0f7-81aa-489d-b86d-4d1729362a7f/ascii_table_c.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_8a11fb7eb88b4cd59650eaf2e1de60b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18984cf-576a-4639-aafc-38a9c8726d03/how_to_fly_the_helicopter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2916b393-de56-4659-88a2-8a56940cae95/what_hero_quested_for_the_golden_fleece.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_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 5684 bytes
SHA-256: 5d27115e811f0a4da9bebd694f48fbfe33993f460f507cb9a0d3efabcf634d40
font_01_sfnt_off0001191c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 11400 bytes
SHA-256: 92853b6ff90748c531bce8a471cc7594d2e2b7b05e30712cdc2dd44eaae967fc

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