Malicious PDF — malware analysis report

Static analysis result for SHA-256 449efec4765c8cd2…

MALICIOUS

PDF

84.0 KB Created: 2021-02-14 19:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 24622e695095c09b0a15123ef75ef63d SHA-1: f3ef0f7fbd4189b72ffb2977ee81aed76b8a1c2b SHA-256: 449efec4765c8cd21241e9b6a29d2e2185eeef2387945de77b7505180f753636
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'linear programming notes' and the authoring application 'wkhtmltopdf', likely a lure to disguise the malicious intent.

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://maypoin.ru/wix?keyword=linear+programming+notes+form+four PDF link annotation
    • https://cdn.sqhk.co/gukisafuw/fiac7CC/ps_remote_play.pdfIn PDF document text
    • http://vifuligotaki.iblogger.org/43016670039.pdfIn PDF document text
    • https://cdn.sqhk.co/rowubuvuke/Jgeiege/coin_master_daily_free_spins_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/gcLOuyt/kuvunevo.pdfIn PDF document text
    • https://cdn.sqhk.co/tegiriwepaj/qDgdja0/make_unicorn_poop_poopsie_slime_surprise.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/ge3orrv/snake_identification_east_tennessee.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/7fXyCcp/western_style_mangalsutra.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/8xKgfia/tapogotawifixezovufa.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/FMjdPjc/space_force_recruiting_station.pdfIn PDF document text
    • http://dayzcommunity.info/buscarv_y_coincidir_excelep66x.pdfIn PDF document text
    • http://newser.site/neserevavivuruaq9o8.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/3xq0Bje/feudal_contract_agreement.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/hcdgfjh/ates_ve_su_5_oyna_oyun_kolu.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/fanuc_r30ib_maintenance_manualhl7bk.pdfIn PDF document text
    • http://shoop-fk.ru/bahubali_movie_dhivara_song_ringtonez767a.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/tsgfjhK/chain_reaction_machine_ideas.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://fonaxijulobep.rf.gd/3120453465.pdfIn PDF document text
    • http://deravamosu.rf.gd/raneron.pdfIn PDF document text
    • http://nadedafusefemej.rf.gd/subtitle_indonesia_before_sunrise_1995.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/basebimenetemopimekijudaw.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_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 5012 bytes
SHA-256: a918bd49cb7337b7c7d9798632e89c2b8c618af2583b2a89e982f7bcab334077
font_01_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 11448 bytes
SHA-256: e19b286692c9ca8fe51e3414f33c2b42e9fcf2693d36313c072b29d98ff23bdf
font_02_sfnt_off00013484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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