Malicious PDF — malware analysis report

Static analysis result for SHA-256 605334979d0e2850…

MALICIOUS

PDF

83.6 KB Created: 2021-02-26 01:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c5858d68a6d80de83a89893deea26a3d SHA-1: c7a45504cbc2728e1285c020eac3d402fb1b7a1c SHA-256: 605334979d0e2850a9806d475a852c8812d481d200019b811a57668791071394
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to link farms hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=ap%20psychology%20sensation%20and%20perception%20review%20pdf PDF link annotation
    • https://cdn.sqhk.co/gapebeve/d4HhdDu/queen_city_running_store_west.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/7Sihifc/between_the_lines_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/sinupupuzaxa/wYhjTgC/54631341488.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/gdegigf/paletivupona.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/h7A6jhI/3d_platformer_super_bear_adventure.pdfIn PDF document text
    • http://xugafigipi.22web.org/kixepewetuvikerumu.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/honeywell_pro_8000_thermostat_installation_guide.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/54381504688.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/9idTphd/4119962630.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/viahiNu/billy_hocus_pocus_costume_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/igSidNv/29429548502.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ximagutetala.epizy.com/how_to_clean_monogram_dishwasher.pdfIn PDF document text
    • http://joxelexudar.epizy.com/vubovizasaxela.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/lg_washing_machine_top_load_user_manual.pdfIn PDF document text
    • http://jotinonikudodi.rf.gd/classification_of_anorectal_malformations.pdfIn PDF document text
    • http://jabaxuzadowepep.rf.gd/balasaheb_vikhe_patil_information.pdfIn PDF document text
    • http://gatutob.rf.gd/nigavebufamisepitokij.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/what_did_bread_cost_in_1985.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 5660 bytes
SHA-256: 9ec294dbda483836ad746874f9b7d7a055c0571ca4890ef4bb2e84e5385c60a8
font_01_sfnt_off00011aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA5 11492 bytes
SHA-256: 5f0450f2ec645715e34a2429517daa166b2fb0f2f1187ace8b024b324e325a34

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