Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8019ee90e5c02b5…

MALICIOUS

PDF

77.7 KB Created: 2021-04-03 04:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a89544640e8f369cf85249a978bda040 SHA-1: 123417863473ba92f56e92be527477eab7f319b0 SHA-256: a8019ee90e5c02b51d2fa7a9d3b83b147fc6a198d441a0adb730db3ba63a5ab7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/award?keyword=follicular+thyroid+carcinoma+pdf PDF link annotation
    • https://cdn.sqhk.co/zedazisem/xlqjGgf/fejeluri.pdfIn PDF document text
    • http://jigezemomesetez.iblogger.org/zuvoxixidiji.pdfIn PDF document text
    • https://cdn.sqhk.co/mebinolopuf/5e2BhgJ/glory_ages_samurais_apk_download.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/nopuzubegasala.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/xv7jcgf/space_battleship_yamato_model.pdfIn PDF document text
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/xixorumub_vozix.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/gdggijc/35588494614.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/dgjZAjj/zuberoxipimelinudufidupu.pdfIn PDF document text
    • https://gifiboluf.weebly.com/uploads/1/3/2/6/132681188/7547791.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/gtP5gjA/invasion_usa_cast.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/adhyatma_ramayana_keerthanalu_telugu.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/tegajepuvubuw.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/ChigjNm/crazy_racing_car_2_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopolug.myartsonline.com/14351421539.pdfIn PDF document text
    • http://mifofoxidil.onlinewebshop.net/zazejovumonojonuvip.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/13140581637.pdfIn PDF document text
    • http://vuvulew.rf.gd/kazaxiwosiraxave.pdfIn PDF document text
    • http://zivonupawidam.atwebpages.com/80442366453.pdfIn PDF document text
    • http://gomugugagaf.onlinewebshop.net/how_to_install_janome_free_motion_quilting_foot.pdfIn PDF document text
    • http://kadanokadija.epizy.com/powatesonolulevepele.pdfIn PDF document text
    • http://legofovivaxom.epizy.com/cbse_maths_book_class_10_solutions_free_download.pdfIn PDF document text
    • http://lurarapekakaka.atwebpages.com/samsung_fridge_catalogue.pdfIn PDF document text
    • http://kemesid.onlinewebshop.net/sherris_medical_microbiology_free_download.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_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 5276 bytes
SHA-256: 69084ee55c72f0cf86806da6985d1326d634af75c02f5abbb7319f8e98f739e7
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 10852 bytes
SHA-256: d48043b6810fe3c3ac8f863ed3328de7e066ab0982c18ffe751ab17a40cfaaad

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