Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa484a8cc71589ba…

MALICIOUS

PDF

79.6 KB Created: 2021-04-14 10:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cf204f87e9a722ed123b85034c000872 SHA-1: 00d701dfe6a48827cbdc4dec095191c1aba9bd19 SHA-256: aa484a8cc71589ba4b0358db22e45a200283dc33bc22ebf63c35d15a3a09ba5f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing lure by indicating a link farm on disposable hosting.

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://vilenefex.ru/strik?utm_term=bowflex+xtl+price PDF link annotation
    • http://boxberry-24.cc/rival_electric_ice_cream_maker_vanilla_recipeqc17c.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunivugame/jfihHjf/navigation_app_android_kostenlos_chip.pdfIn PDF document text
    • http://vevovifox.scienceontheweb.net/care_credit_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/fgepLgd/sd_virus_dance_academy.pdfIn PDF document text
    • http://wefufivubulal.medianewsonline.com/bitafi.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/final_fantasy_xvi_trailer_reaction.pdfIn PDF document text
    • http://gprofights.ru/shams_tabrizi_40_rules32r47.pdfIn PDF document text
    • http://lienforkid.com/stream_games_from_pc_to_android_tvckucc.pdfIn PDF document text
    • https://cdn.sqhk.co/gokarunedod/bhfVHX7/vajew.pdfIn PDF document text
    • https://cdn.sqhk.co/wopiwozaso/YhhjimD/50680123785.pdfIn PDF document text
    • http://novubelugalij.medianewsonline.com/novel_layla_candra_malik.pdfIn PDF document text
    • http://koolmaxt.online/51893037791qgxll.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://motagetezo.epizy.com/vusibenizufakoxifa.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/darling_tamil_movie_song_ringtone.pdfIn PDF document text
    • http://ralefab.rf.gd/axiologia_definicion_segun_autores.pdfIn PDF document text
    • http://rarisirifamawod.rf.gd/54713876007.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/65660429081.pdfIn PDF document text
    • http://luxupuxud.myartsonline.com/viponojix.pdfIn PDF document text
    • http://latilofu.rf.gd/derived_units_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/piriformis_syndrome_treatment_cortisone.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/what_to_do_with_high_blood_pressure_headache.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 4512 bytes
SHA-256: 48873f263332eb304ba9c5cba8a6a5ab4628d56209f712989515ca46ea4a115b
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 11120 bytes
SHA-256: f968c5489bf4ace26dba0c07836446e828f8d0b743dbc2491eda8dd9d342a578
font_02_sfnt_off00012387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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