Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d11df3cd07ed33d…

MALICIOUS

PDF

76.4 KB Created: 2021-02-28 20:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 13f0957a655a14a661265c145a5107b7 SHA-1: 9ef98b46399565a12e348de482cfd2bc7ba383f5 SHA-256: 6d11df3cd07ed33d49d47b15069250e7b46e89384a3f22c4adf911dfd4c09b7d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains, many of which are part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to trick users into downloading malware disguised as firmware updates. The ML classifier and ClamAV detection further support the malicious classification.

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://kuzutuzo.ru/strik?utm_term=wd+live+firmware+update+2017 PDF link annotation
    • http://vereffka.xyz/why_is_my_tv_remote_start_not_working5f7ct.pdfIn PDF document text
    • http://zoo-taxi.site/rehras_sahib_download_mp3_mr_jatt6owfi.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/ryobi_254mm_compound_mitre_saw_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/ijjYqje/broken_bones_game_motorcycle.pdfIn PDF document text
    • http://wowitaly.pro/kumpulan_rumus_kimia_sma_lengkapy06al.pdfIn PDF document text
    • http://whysmall.space/879942047449w7iu.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/1aa6qic/doguzegomubazugibesej.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/fisher_price_roaring_jumperoo_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/nunewole/bhflQzM/39536092421.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/eV0ISgg/swot_analysis_threats_examples_for_students.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/how_to_install_autodesk_autocad_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pazepoxi.atwebpages.com/samsung_xpress_c480fw_toner_yellow.pdfIn PDF document text
    • http://sadusijof.rf.gd/38022825022.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/52276668732.pdfIn PDF document text
    • http://xilagerezob.epizy.com/26502971865.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/58637113160.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/pokemon_nds_emulator_apk.pdfIn PDF document text
    • http://rixexovujawuvow.rf.gd/jump_starter_cables_walmart.pdfIn PDF document text
    • http://zurabogefu.rf.gd/fanuc_arc_mate_100ib_manual.pdfIn PDF document text
    • http://podapuleleg.epizy.com/chomsky_normal_form_exercises.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_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 5580 bytes
SHA-256: 9aea8879b1d8b42f46b8557b3f470326bac16da1ce6be97db240dc62762be40c
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 10836 bytes
SHA-256: 41794031b96071f467428881a0c11693a3ab3eb8177306628850f5efe23522c0

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