Malicious PDF — malware analysis report

Static analysis result for SHA-256 253265705abef64d…

MALICIOUS

PDF

75.1 KB Created: 2021-03-20 11:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 82b41096e268770326db60b5391a62a6 SHA-1: 024ec854102c9871bcecf05f013857a9caeec0d3 SHA-256: 253265705abef64ddba4eb8f93512df526f6637f64e763ca3c0a55935257ddbe
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is identified as a link farm on disposable hosting, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. The embedded URLs, such as 'https://leonvi.ru/strik?utm_term=do+beats+by+dre+have+warranty', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=do+beats+by+dre+have+warranty PDF link annotation
    • http://naturfresh.space/zumezuvalotukolu90l0w.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/the_devil_wears_prada_dwight_shirt.pdfIn PDF document text
    • http://igcopyrightverify.com/36734707743kkupi.pdfIn PDF document text
    • https://ginekimef.weebly.com/uploads/1/3/0/7/130738874/moguxusimula-remof-wakogowes-mixuzovaxix.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/bozesunoveliravux.pdfIn PDF document text
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/bikikutexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabotojixupi.atwebpages.com/bazaninukumuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/samsung_s4_mini_battery_draining_quickly.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/remington_700_bdl_223_accuracy.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/82416342688.pdfIn PDF document text
    • http://karatufi.epizy.com/clash_of_clans_bot_for_android.pdfIn PDF document text
    • http://wetavirevamo.epizy.com/presentation_of_self_in_everyday_life_trade_ed.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/disgaea_5_strategy_guide_download.pdfIn PDF document text
    • http://gajovab.epizy.com/87311456313.pdfIn PDF document text
    • http://kisezemewarajox.rf.gd/siren_blood_curse_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/zajudovi.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_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 5272 bytes
SHA-256: f69ed519e5d939e7ab90f8d35aa1a6d4a20c57534b0499e3a13958426d6029ea
font_01_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 11448 bytes
SHA-256: df68540a029fdc9f51220f5c0bab71041de099c3c944494ee2ab0d6eef0b8143

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