Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fcbe39c9fdcf66…

MALICIOUS

PDF

77.3 KB Created: 2021-05-18 17:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa640ec999b0920fe6338da3945da75a SHA-1: 2e30cbda36aaa6bb8692f406c6c077fba572fe3f SHA-256: 80fcbe39c9fdcf663fc7b1d4fa8a5064b8a670d2b2e88e44cb58fe08b8358ada
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely attempting to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=natalie+portman+thor+4+workout
    • https://cdn-cms.f-static.net/uploads/4454971/normal_60405147c35a1.pdf
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/semekoseru.pdf
    • http://limowoduramu.iblogger.org/zawutemugadebabajewovop.pdf
    • http://tumerasiwabuzip.22web.org/49068404445.pdf
    • http://xupelomepole.22web.org/leblanc_guide_8._11.pdf
    • https://cdn-cms.f-static.net/uploads/4428069/normal_604920b918f00.pdf
    • https://matopudalerem.weebly.com/uploads/1/3/5/3/135318895/de9ba4b613faf65.pdf
    • http://durebivov.iblogger.org/web_services_example_in_java.pdf
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/walipoxebe-kagomesima-xofojev-farupe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bomofafavadu.rf.gd/when_can_construction_start_in_nyc_covid.pdf
    • http://bupubuvapefumi.epizy.com/autoincrement_sqlite_android_studio.pdf
    • https://s3.amazonaws.com/kotenu/biddeford_electric_blanket_blinking_light.pdf
    • http://biwabuw.epizy.com/hands_on_machine_learning_for_algorithmic_trading.pdf
    • http://wilunimexa.epizy.com/business_card_template_cdr_free.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/71519463593.pdf
    • http://fizikijusesava.rf.gd/fybsc_it_syllabus_mumbai_university_2020_17.pdf
    • https://s3.amazonaws.com/nuxepiduded/gorixomeludidegifubakepu.pdf
    • http://xekubot.epizy.com/cannot_resolve_symbol_nullable_android_studio.pdf
    • http://zawagebojirowe.rf.gd/backing_up_android_phone_to_computer.pdf
    • http://joluluseliwawi.rf.gd/put_animated_gif_in.pdf
    • http://paxutujunix.rf.gd/tojudiripibudofu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f228.bin
a6ef92120f7b272152343a7b9411f3807925db0f71c7ce5e8e4a3ba6338088ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 5092 bytes
font_01_sfnt_off0001036b.bin
0b71171bb0e120fb955cd9810435baa199881c33225f813009c9b3cfa068cb04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 10656 bytes

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