Malicious PDF — malware analysis report

Static analysis result for SHA-256 16422b63b6126848…

MALICIOUS

PDF

92.2 KB Created: 2021-03-10 03:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4828888236e6f2545fe9ab6b1779f0d0 SHA-1: bd4da4b42d78ca533c264076dd68688f0996363b SHA-256: 16422b63b61268483dbab27c316c35ace78c57a2ac40734b7e5a1698d824e2ed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/aws?utm_term=is+doing+crossfit+wod+enough PDF link annotation
    • http://vovpomnim.ru/what_is_the_purpose_of_experimentation_within_the_steam_experience242fr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456982/normal_5fda4702d7135.pdfIn PDF document text
    • http://in-arenas.com/inlay_router_templatesc8hhl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479718/normal_5fdf6741e8174.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5ff9bedd99565.pdfIn PDF document text
    • http://velixone.66ghz.com/bus_simulator_2018_android_games.pdfIn PDF document text
    • http://boldly-grow.com/72496889030g8ekh.pdfIn PDF document text
    • http://copyrightsupport-ig.com/transducer_mounting_plate_instructionsw9epr.pdfIn PDF document text
    • http://biggymstoe.com/watewawojuraxituxisaran0tl82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367911/normal_5fed25bbd8cee.pdfIn PDF document text
    • http://invitesistem.ru/gatanufumctix0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_60367558028a2.pdfIn PDF document text
    • http://igbusinessabouthelp.com/nesozuvijifurejivm61x9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://begilokikilox.rf.gd/peer_gynt_suite_no._1_in_the_hall_of_the_mountain_king_by_edvard_grieg.pdfIn PDF document text
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_085e331f8f7640e2a4ff2a352ef64218.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_f0c6dbe2e5124624a08bd25634b5d22b.pdf?index=trueIn PDF document text
    • http://domumulavonevef.rf.gd/scorch_trials_full_movie_dailymotion.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_6d1f41285521412c8cfe3d4465bc4bad.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_499acac348564466ae2104b5b9c8c84c.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_122698e042054645a4ebfad1ae20f434.pdf?index=trueIn PDF document text
    • http://xapimiwosusuv.epizy.com/what_is_the_purpose_of_what_to_the_slave_is_the_fourth_of_july.pdfIn PDF document text
    • http://puredaw.rf.gd/how_to_use_a_holmes_humidifier.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_f725a8d0dfcb4f03a4ddb61432ddc7a1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 5072 bytes
SHA-256: 0f097e4289f78375cb70b894fbb03d4edb693fd06a902f794f963c2f6785b360
font_01_sfnt_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00013af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF9 11460 bytes
SHA-256: 0ec82a2e11f41397c71252997dfc2d1b232f2e95eb590122fdf1124596ce6cd1