Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a2a908e5aa1d71…

MALICIOUS

PDF

79.4 KB Created: 2021-04-14 03:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b859857bb15f4c977fde5c6cff1eb1e SHA-1: 2102d4afb07aeb4bbebe39ac7ba6fef9d491a933 SHA-256: 09a2a908e5aa1d71b33123fa9ed11268827771d193078e12653fefbb19bab3ac
126 Risk Score

Malware Insights

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

The PDF document uses a lure related to 'Bissell pet carpet cleaner instructions' to disguise its malicious intent. It contains a high number of external URIs pointing to disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest maliciousness.

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=bissell+pet+carpet+cleaner+instructions
    • http://xovijezup.mywebcommunity.org/bsc_chemistry_syllabus_2020.pdf
    • http://selafakokag.22web.org/33210691515.pdf
    • http://tusiteguluvora.getenjoyment.net/asus_crosshair_v_formula-z_ram_compatibility.pdf
    • http://liwojabegeje.iblogger.org/define_traditional_musical_instrument.pdf
    • http://lixorajepidil.mygamesonline.org/jifojogowit.pdf
    • https://cdn-cms.f-static.net/uploads/4456676/normal_603b8200ea272.pdf
    • http://andyhong.blog/6514020708f1l96.pdf
    • http://yozi.store/4834028994du9nb.pdf
    • https://cdn-cms.f-static.net/uploads/4420905/normal_60179bc8a0f30.pdf
    • https://cdn-cms.f-static.net/uploads/4487005/normal_602b298a98665.pdf
    • https://cdn-cms.f-static.net/uploads/4369189/normal_60677a0163b1a.pdf
    • http://nurokojo.mypressonline.com/somenunafaximibotoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zemigiduwagafu/chennai_express_movie_in_hd.pdf
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_6d75d47dbc62485494ae8da28feca2f8.pdf?index=true
    • https://s3.amazonaws.com/figidireki/how_to_integrate_1_cos2x.pdf
    • http://vojuzegi.epizy.com/sololearn_html_fundamentals_answers.pdf
    • http://pavoserelolaw.epizy.com/mefepewuz.pdf
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_d13986b61c3248bfb1773bb4eacf0354.pdf?index=true
    • https://s3.amazonaws.com/sosupejuxofedo/gas_testing_questions_and_answers.pdf
    • https://s3.amazonaws.com/feliso/autostart_android_app_example.pdf
    • http://fajazimigig.atwebpages.com/ayurvedic_books_in_kannada.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_off0000f6ca.bin
01899f02f8eeb0e98790f7edc3b159fe997c7f74272a0469d0cc73fd56136031		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 4976 bytes
font_01_sfnt_off000107c6.bin
e80bb688b7bf16a649e3ec22014b53382601db5e4e8d74f00b098c808c6661f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 11152 bytes

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