Malicious PDF — malware analysis report

Static analysis result for SHA-256 102df7efa6391c5c…

MALICIOUS

PDF

90.2 KB Created: 2021-04-01 04:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2ad7c61940e6dd3129e94b130e188dbd SHA-1: be997faafabbf5ea55dc07ff17bf32ee72483604 SHA-256: 102df7efa6391c5c7c520b3e942928215ffa80c00e03543f4886a24b1ca47c8a
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, likely to obscure the true malicious destination.

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://jacksth.ru/strik?utm_term=academic+writing+examples+with+author PDF link annotation
    • https://cdn.sqhk.co/dagosasojo/fqESjjZ/wingstop_coupon_code_free_delivery.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/jamupovabunu.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/hih9ibh/perfect_cutting_barber_shop_carrigtwohill.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/91537368215.pdfIn PDF document text
    • http://tibujodokerijer.22web.org/96414715332.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/nhajggh/halloween_stores_near_me_open_now.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/brisbane_train_map_2020.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/09bec14a-68f8-4df5-9284-2083d264b835/what_does_the_new_testament_say_about_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c2ab80-a4df-49f2-809e-6400e043686b/maxiscan_ms300_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2125a4b-93b1-468b-9236-607695223716/how_to_do_a_running_record_on_any_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f9def9-ac8a-464f-92f7-930a13aa1756/11336410511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532fe801-3707-4d6a-b19b-3d31ab178cb0/dokuvesopazakatebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0884b9ab-8983-48bc-9949-5ad182809c5a/black_and_decker_rtx-6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb935ab-3c3b-4257-9981-e7b778c999b5/sears_roebuck_catalog_1900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2969c45-1e07-498b-b04b-0747ade50d5c/52040356782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc88419-cd76-4e8d-a654-2c6b719f2808/retanotugoxebavupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7a7e7b-8590-4474-99f7-164708362ae2/can_you_control_a_roku_without_a_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f0979f-6af7-4599-be1d-c4fd2fcb2651/how_to_replace_battery_in_apc_ups_rs_600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7016d95-fda2-402a-be22-a5fdd75a1f63/business_management_for_dummies_book_2014_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b939a6-cf6d-4699-b8f9-e63e43ea1976/medx655dw1_not_heating.pdfIn PDF document text
    • http://kuzezoma.epizy.com/free_psychometric_personality_test_questions_and_answers.pdfIn PDF document text
    • http://dakamonegip.rf.gd/coleman_powermate_3000_generator_manual.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_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 5636 bytes
SHA-256: 8efbb380c7fa7adcf28a19c88e9bdc6b7a55f5f0805cb75c56cd5b2ea9280e84
font_01_sfnt_off000135c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C9 11152 bytes
SHA-256: 2a872c9c7f028c60e1e8c896967e66d4e08b6d5dcc54198a0afc7318bca3e53d