Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd6fb7d66465e04…

MALICIOUS

PDF

79.6 KB Created: 2021-03-21 11:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4355570360ef89e08650558bb5859f68 SHA-1: 9dfec45f0ae3e0b2eabedd70ce50e3e9e1e86562 SHA-256: dbd6fb7d66465e04a0518c84c6f9672db7e5acef0d211be0d0a548ff52f6ab50
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://jumiwimov.ru/wix?keyword=aledo+middle+school PDF link annotation
    • http://websecurer.tech/android_handheld_game_systemjm0rr.pdfIn PDF document text
    • http://bajuzupur.22web.org/managing_land_contamination_planning_guidelines_nsw.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/fallout_4_console_command_get_perk.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/10797820977.pdfIn PDF document text
    • http://opros.xyz/kewarobikutal5d7i.pdfIn PDF document text
    • http://idealica-italiaoficial.site/iphone_remix_ringtone_zedgexehtp.pdfIn PDF document text
    • http://ludshop.xyz/595125517059s4iw.pdfIn PDF document text
    • http://xteenware.online/99959234173qnbmd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/25232105649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e49ac4-fc8b-4b3d-9caf-8ef73dc29a63/zifagutabikukajarovufafif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a6a935-11a6-484e-8cc4-ed9cb8888258/how_to_run_python_project_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3ad8b1-41ac-4f64-87bf-23b0620dac9f/sidixazekuvajolave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287d8f59-d99a-49d4-b548-8044c4847342/binomial_theorem_probability_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/how_to_become_a_civil_engineer.pdfIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_06ef20c418404a6ba712064bf7637435.pdf?index=trueIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_3af42e68a5eb44f7a7030e8efe2e39db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/941d320c-05c6-43e7-b6ba-c81facc1635c/35169028932.pdfIn PDF document text
    • http://pajuzipoxebemo.rf.gd/how_to_clean_a_primo_water_dispenser.pdfIn PDF document text
    • http://pegalisijeg.epizy.com/latest_ugandan_songs.pdfIn PDF document text
    • http://wujinagupiw.epizy.com/airshou_ios_12.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_d238b3762c4b4f6f9f5bb06c66f2fa91.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/2702957903.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_a9530f68ac544688a454bf9ee13ced3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokelur/david_irwin_basic_engineering_circuit_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/15265642475.pdfIn PDF document text
    • http://beverotunege.epizy.com/stalker_pro_2_radar_gun_manual.pdfIn PDF document text
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_aa0aae280aab42e5a87f300e144ccc02.pdf?index=trueIn 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_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 4864 bytes
SHA-256: c52320e66d303d4d2ce009f1f172ab385cab0fc6bebdd3c79eef5f8b5085423d
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 10704 bytes
SHA-256: 63739326072378b666ba46189069f7a69effe87c198f3bb7a6f15a94f16209f1