Malicious PDF — malware analysis report

Static analysis result for SHA-256 3326c9a2dae1150b…

MALICIOUS

PDF

73.0 KB Created: 2021-02-15 19:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 52a7e4184c105aac199f3014fac73cc6 SHA-1: 285008597b6f6e2489a3e67a5578ad35b44055d6 SHA-256: 3326c9a2dae1150b49483aec796cbc90002a19ef739cf07b247d75b022da6277
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and hosted on services like sqhk.co, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wix?keyword=que+son+los+electrones+de+valencia PDF link annotation
    • https://cdn.sqhk.co/dibidoretu/jiVhehi/62492421480.pdfIn PDF document text
    • https://wozuxepu.weebly.com/uploads/1/3/4/4/134478893/5103982.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/bjiBsjb/simple_reversionary_bonus_lic.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/idGKGib/new_sonic_boom_mod_minecraft_pe.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/gdGlhhY/troom_troom_en_unicornio.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/5iiuBcG/doom_2_master_levels_mephisto_s_mausoleum.pdfIn PDF document text
    • http://decideyouself.fun/97859689807higs7.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/novurenupeforubamavorelbmcd.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/FYpeBhd/47265081853.pdfIn PDF document text
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/4f18f.pdfIn PDF document text
    • http://sq11mini.com/45684839839nvt65.pdfIn PDF document text
    • https://cdn.sqhk.co/lomotutuwe/dThbFIF/75969865800.pdfIn PDF document text
    • https://cdn.sqhk.co/vuranataxu/2Thcnjf/bomber_crew_gameplay_espanol.pdfIn PDF document text
    • http://wbigs.space/chokher_bali_novel9t8zn.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/tofemejakazupomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/4512526420.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/wow_classic_addon_auctioneer.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/96636019632.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/mod_apk_temple_run_2_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/radical_reformation_and_the_anabaptists.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/85043290315.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_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 5052 bytes
SHA-256: 017252e3bc839e9a36aa5c0e545a76c19040ce4b6bced78fe0735544987c2e50
font_01_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 11076 bytes
SHA-256: 2eac1a40891479dd494269bd8bffd416a167eda1d00bea6910991b3cd073ca2f

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