Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4338a4897fbe75…

MALICIOUS

PDF

74.3 KB Created: 2021-03-19 13:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0109e9e4d5f97cec199d45d636f7c1f0 SHA-1: ea64135540a88c6605ad2d1ada54c533be1ae62d SHA-256: de4338a4897fbe75622bd07416b343951d29f992b55f0eb5b7a86de2389704d4
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm on disposable hosting, designed to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to a malicious domain like 'lozipotod.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/wix?keyword=geometry+lesson+1.1+answers PDF link annotation
    • http://hangzhoumetal.ru/toilet_cistern_repair_guide_ukijqdm.pdfIn PDF document text
    • http://trendmobile.ru/sanezokawixowo6gbjv.pdfIn PDF document text
    • http://xitaboketeloba.iblogger.org/pefasugulizixupodegefige.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/5df18a6e-d8cf-4fb2-89ea-836ce67dd0ad/laninumofopubafuposiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/58170291977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea065896-6392-4165-af6f-b24bbd5b2f91/75909907834.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/bing_video_er_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e958e853-d4d6-4786-9928-d827680766f0/best_home_espresso_machine_2020_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c05878-6544-4f91-90a7-f00d9174f517/mezonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ae8123-8cba-4d37-89a7-1b8d9493ad0b/77563449393.pdfIn PDF document text
    • http://zuvidetalenaras.epizy.com/20958478169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5d639e-95a4-461a-9976-840c97b79412/lg_6.5_kg_front_load_washing_machine_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcbc2c71-17ce-4e7a-9715-429224c2be8f/tuferegoneb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8497e4a1-aeda-41fd-b7f3-61f8b4b8f737/arduino_programming_tutorials_how_to_stop_void_loop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae80899-bf68-4477-bb80-909c9033aaea/1681750449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e452336e-eed3-4cde-a24c-719aff085da6/jubodilimigu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/fasting_blood_sugar_guidelines_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/kedusu.pdfIn PDF document text
    • http://gunagiweraji.rf.gd/budget_planner_program_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf98d37-43ea-41be-a23e-24f983858631/fluid_dynamics_simulation_python.pdfIn PDF document text
    • http://kofadokajofej.epizy.com/vavanosejomaf.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_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 5140 bytes
SHA-256: 4258873290abf38fecd4a5529a4763f61f481120ec4f0e28c1345c0326ab56ae
font_01_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 10780 bytes
SHA-256: a48f485d45458544677dbd93ce8cb47222c5bccf34a47fb0aa05087bd73ad286