Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8722760923a6a43…

MALICIOUS

PDF

73.7 KB Created: 2021-03-23 09:37:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dfa47e3c46803557b3b7ce84d3a76871 SHA-1: 0f2545b41b147547a0db8c97d2223667d051d501 SHA-256: f8722760923a6a437a12240909ff470deb9d08f6e1c3f16eb9641eb560eaa4cc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=solving+linear+inequalities+test+pdf PDF link annotation
    • http://fabulouss.space/dikufuews9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_601bf9ea88343.pdfIn PDF document text
    • http://indital.fun/how_to_activate_pa_ebt_card_onlinezrnnf.pdfIn PDF document text
    • http://tasiperop.medianewsonline.com/agetar_pichetar_in_punjabi_language.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/viral_gastroenteritis_patient_education.pdfIn PDF document text
    • https://budonofo.weebly.com/uploads/1/3/4/5/134520747/papijife.pdfIn PDF document text
    • https://xixefofitajeres.weebly.com/uploads/1/3/3/9/133999179/b6110b0c7b621c.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/87178250956.pdfIn PDF document text
    • http://lanufutado.22web.org/ramozumagajinisopajiwap.pdfIn PDF document text
    • http://copyrightnotices-form.com/the_tower_of_nero_the_trials_of_apollo_book_5_summaryuc3ri.pdfIn PDF document text
    • http://natlab.ru/revosexepulajbylv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_5fdaf8c67cbf5.pdfIn PDF document text
    • https://difomojixi.weebly.com/uploads/1/3/4/3/134319012/vimivupavivimu.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/miss_peregrine_books_genre.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/2020543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_602b368c59402.pdfIn PDF document text
    • http://kavademive.sportsontheweb.net/51151320869.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/why_do_we_write_research_papers.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/62031552049.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/curs_astronomie.pdfIn PDF document text
    • http://a-trvl.ru/10955965507rma4t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403263/normal_6056c0af7d144.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/jivilaxelipawodiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://madukavinoxonal.epizy.com/what_is_the_best_hoover_windtunnel_vacuum.pdfIn PDF document text
    • http://wibumumodudofud.epizy.com/biomes_activity.pdfIn PDF document text
    • http://repudazuvokidef.epizy.com/nivopun.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_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 5500 bytes
SHA-256: dd656fd799194467b14739678f5f698576497f38db8f14f76dfada1dd2ce40f3
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 11332 bytes
SHA-256: d99a18d3b5bd95f86f5031ff1ac80c384c92b402e6f7e5fcc603bf871028450c

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