Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc93ec3326e0b45…

MALICIOUS

PDF

74.9 KB Created: 2021-03-15 20:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: de621d180f56a4a766e68b5854f90228 SHA-1: 5ae16e3894711c3bb15d3e364cbd7480b39f9a25 SHA-256: 4dc93ec3326e0b4562cedd0e30207f34a5e88f22b90acd64de58ba6747f68a6e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a primary one pointing to 'fokemale.ru', suggesting a redirection to a phishing or malware distribution site. The document body, though heavily obfuscated, appears to be a lure related to search terms, reinforcing the phishing pretext.

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://fokemale.ru/strik?utm_term=in+christ+alone+piano+sheet+music+easy PDF link annotation
    • http://zotoxilob.getenjoyment.net/cycling_merit_badge_workbook.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/dCq3ngX/ancient_rome_siege_warfare.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/3heeIhd/space_simulator_apk_latest_version_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/8iaihXR/minetest_free_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/jqrghdq/jiwapagosetimazatov.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/a798e621-29c3-481c-b444-e548d159f977/american_airlines_baggage_weight_limit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da0c186-5253-453b-a580-63173d45827e/brother_hl_5450dn_reset_drum.pdfIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/antonyms_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dafc0893-28b3-4e82-b6f7-787449970c24/72184004096.pdfIn PDF document text
    • http://tidizovebimike.epizy.com/29817164477.pdfIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/mosevuxakemado.pdfIn PDF document text
    • http://wuguvorejapak.rf.gd/rca_3-device_universal_remote_rcr003rwd_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003fc3a6-6faf-4c0c-b2ee-e10301765394/integrated_chinese_level_1_part_1_lesson_4_workbook_answer_key.pdfIn PDF document text
    • http://lugaxelike.rf.gd/administrative_office_of_the_courts_nc_forms.pdfIn PDF document text
    • http://kodinola.rf.gd/whatsapp_messenger_latest_version_2018.pdfIn PDF document text
    • http://xabetalofel.epizy.com/vanulage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb84ca6-7db0-4a97-ba72-28f498cf5b49/vovola.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/how_do_i_access_wd_my_cloud_from_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a47702-14fd-4641-bd87-506744b11a4b/68168147677.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 5212 bytes
SHA-256: 3fe5fc2b2d12d81f1e16addeb98ab0a983aed20fbe008ebdc9972245a7c67a05
font_01_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 10840 bytes
SHA-256: f677f8face9d8de1345f1b5d885b9f0e8fbf0fa084930b97c249db81631938f3

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