Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dd22531b545aca…

MALICIOUS

PDF

75.2 KB Created: 2021-03-18 05:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: daa16706aed915ee622ea435ed607d42 SHA-1: b5ac6036f48218136c294da0878045036eb88212 SHA-256: 68dd22531b545acaa5ba062b4e7f85d1311017cb4d1c1789cf775fa3d76a2a9c
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external links, many on disposable hosting and using UTM parameters, suggests a phishing or link-farming scheme. The document body, though heavily obfuscated, contains references to '1st grade worksheets printable' and 'wkhtmltopdf', indicating a lure to disguise malicious links as educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/123?utm_term=1st+grade+worksheets+printable PDF link annotation
    • http://bioforcecolumbia.site/how_to_use_samsung_smart_tv_remote_to_control_cable_boxjdw4i.pdfIn PDF document text
    • http://thechambre.xyz/excel_formulas_books_free_downloadowtls.pdfIn PDF document text
    • http://swiss-gear.store/qu_significa_soar_que_se_te_caen_todos_los_dientes_de_la_bocaqjfqf.pdfIn PDF document text
    • http://dosemamorozaj.22web.org/zupanedosexutuwufugiku.pdfIn PDF document text
    • http://alexsaf.ru/jorarefusedagemufiwuvisa9rl92.pdfIn PDF document text
    • https://cdn.sqhk.co/vezubusevof/cU0jbtE/66944435893.pdfIn PDF document text
    • http://mmeueue.space/fifa_19_fut_card_creator_fifarosters258yf.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/hjwBxWq/5698080109.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/id2bigL/52991578179.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/jijjdjd/telonawodumuduwatomo.pdfIn PDF document text
    • http://gujafegugemex.iblogger.org/84064365567.pdfIn PDF document text
    • http://zidexogatik.22web.org/wing_chun_illustrated_magazine_download.pdfIn PDF document text
    • http://mon-cmso.best/talikivap4mqba.pdfIn PDF document text
    • https://cdn.sqhk.co/lifupowaseli/F1hcBic/zojozofofegilalifarovowa.pdfIn PDF document text
    • http://agreevudb.rest/laptop_keyboard_not_working_acer_e15sofi2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_c07ac50890c845389133cd2ae0026b6a.pdf?index=trueIn PDF document text
    • http://wosumobikufiw.rf.gd/law_firm_invoice_template_word.pdfIn PDF document text
    • http://tipumajusu.rf.gd/59110532309.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_406be84a43b94fe19c180034db7fdb99.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_4d759308851d4d5f93d3fc932199be5d.pdf?index=trueIn PDF document text
    • https://bc881323-2374-4635-a2b7-f126f9929bd8.filesusr.com/ugd/546a35_f7c2968dc63642998959d9487c7f73a8.pdf?index=trueIn PDF document text
    • http://putedugiganipa.rf.gd/lidosekuxujeveliworab.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_278513f53fb64345965b73c7c979db0d.pdf?index=trueIn 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_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 5472 bytes
SHA-256: 7c77032d48f649cd81cbf324101ffad5015d5c2761a082181001d65240e4d50c
font_01_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 10996 bytes
SHA-256: cc5f9ea810d31fe96ea5a57d55b3fd81c8cce58343dc36263f1f92b7c75aed6a

Open this report in the interactive analyzer, or submit your own file for analysis.