Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b0df71c0c58751…

MALICIOUS

PDF

68.5 KB Created: 2021-03-16 02:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9a2f8c7620dcbcaac3f7386663f4d830 SHA-1: 2b6fa643eb9489b889f7e64d90ec628f91ff5276 SHA-256: 60b0df71c0c58751517eff8a0ab4068ef118b813d36d0d851f12ad8b46fa88d1
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to educational content, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=vocabulary+workshop+level+f+unit+6+vocab+in+context+answers PDF link annotation
    • http://dupovim.iblogger.org/calculus_book_for_bsc_1st_year.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427514/normal_5fe0d95a756db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464996/normal_603994d0c55ca.pdfIn PDF document text
    • http://zumepelilebatu.22web.org/85006807314.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390996/normal_5ffcf189400ea.pdfIn PDF document text
    • http://gonimuliveza.22web.org/tratamiento_de_anemia_megaloblastica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_601afcb38cd89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xitamedasunur.rf.gd/best_movies_of_2020_metacritic.pdfIn PDF document text
    • http://jilufadipubo.epizy.com/importance_of_energy_in_our_daily_life_as_a_student.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_60fb683a8c56417e8bbb4f80eb3fc2fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6913dbed-0429-4f4a-8fb5-946e3cf4e4ef/anet_a8_motherboard_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a2826bd-556e-4129-bc82-84482b3c95ba/vivunigirajosono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe68e2e4-f686-41f2-aed8-ba43217ae641/3_metros_sobre_el_cielo_2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18432140-daeb-4b16-8425-15203b108330/57800758244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4a1a69-f949-45d1-8326-f40b5d715e34/cuisinart_12_cup_programmable_coffee_maker_with_grinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391f2945-c888-47b2-ac02-42745ed18d59/81602026629.pdfIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_07868c6759b74dccbd5c4da2935f7136.pdf?index=trueIn PDF document text
    • http://mapitixonemo.epizy.com/tajivudufowalefepadabij.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_4d744b57418e4086b63349aa7dfbe58b.pdf?index=trueIn PDF document text
    • http://kubemumibesedu.epizy.com/tunuxap.pdfIn PDF document text
    • http://vabedit.epizy.com/10421882748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb85515-55d0-453f-97d6-bd1fa330400e/xikadakunanunitemuxifewe.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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 5748 bytes
SHA-256: 1b60bb1d1b5ab2b002cf071a5cff86acf3e482c8acc63e32b6ef22a3166df47b
font_01_sfnt_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 10328 bytes
SHA-256: 3d849c6a5df57d35898aadfe8169a500a6b60d73a705fd53030c5d481b22a00f

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