Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a910a6603193b47…

MALICIOUS

PDF

76.6 KB Created: 2021-03-23 23:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d451e760db184098b53ebb6d87c8c5e7 SHA-1: 259db38b04284feed1bb086fdbbece9da8e36c5d SHA-256: 0a910a6603193b472cca96753d619bbee738da47740c1a2c26141008f068a3ed
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one pointing to 'nipisod.ru' and another to 'revilokepudidu.mygamesonline.org', suggesting it is designed to redirect users to potentially harmful sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this document is part of a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nipisod.ru/wix?keyword=greenville+county+sc+2020+school+calendar PDF link annotation
    • http://revilokepudidu.mygamesonline.org/xuviwozi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378406/normal_6007b6b14552b.pdfIn PDF document text
    • http://fumigatoff.online/attack_on_titan_manga_character_listw3oxv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503533/normal_5fedab9bc1bf2.pdfIn PDF document text
    • http://tevituvodejifep.mywebcommunity.org/atrial_fibrillation_guidelines.pdfIn PDF document text
    • http://wowitaly.space/engineering_ethics_report_example97cgi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419441/normal_5ffeae42b4498.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/99430652349.pdfIn PDF document text
    • http://kukushka.space/kitchenaid_cooktop_red_knobsosj34.pdfIn PDF document text
    • http://hookup681.site/fugikutozadudevalakm4s1.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/torajat.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/where_to_donate_used_pet_supplies.pdfIn PDF document text
    • http://leludezoz.scienceontheweb.net/amazing_grace_a_cappella.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5ffbf1c47d34a.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/the_black_womans_guide_to_understanding_the_blackmanis68w.pdfIn PDF document text
    • http://palawawez.mypressonline.com/65584020045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_60277e165c747.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dujupopo.epizy.com/bewonodamuzutuzobi.pdfIn PDF document text
    • http://sudonek.epizy.com/59271434356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16179c70-fbf4-4f8f-a5e6-37c25720ee95/trimble_business_center_5.2_requirements.pdfIn PDF document text
    • http://debagejusuwaj.epizy.com/1373298370.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/jenip.pdfIn PDF document text
    • http://likewiwojuxus.atwebpages.com/55069110446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3d39c5-ea5c-4465-8e2d-b81057746dba/1960s_dc_comics_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b946085e-6cb5-44ac-b640-6f9e7055e269/welobebabunevuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f99de6-3ccd-4092-80dd-a21a28180989/alfred_piano_book_1.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_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 5492 bytes
SHA-256: 281aaedb999d07b681829ac9ecfb45f71e919833cca4974494de37925d0a06df
font_01_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 11040 bytes
SHA-256: 6d8d5603e7942ac07833cb9a3d07dc4eeaf021bf6d10e816383e4755ef095096