Malicious PDF — malware analysis report

Static analysis result for SHA-256 80821fabf8b8e495…

MALICIOUS

PDF

76.7 KB Created: 2021-02-28 13:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7ccd45af7dc9a7c2fd334d34c6547330 SHA-1: ec4890cdbd7cec920c60af9c7025d67798967d30 SHA-256: 80821fabf8b8e49599d4c7d6a5c009054941913b97ed5ffcdd9062c99d58ebce
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful 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://pelibifir.ru/123?utm_term=baseball+in+april+and+other+stories+pdf PDF link annotation
    • https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/wexep.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/hp_officejet_5745_color_ink.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/mewagaduvelikar.pdfIn PDF document text
    • http://aydym.club/how_to_get_freelance_design_work_ukgo8hh.pdfIn PDF document text
    • http://narosisebono.22web.org/cinetica_de_crecimiento_bacteriano.pdfIn PDF document text
    • http://lifeeuro.info/can_you_keep_a_secret_song_barbienicld.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/what_does_bao_mean_in_chineseij4e2.pdfIn PDF document text
    • http://nigma24invest.online/sibozadunekomalukivadnkark.pdfIn PDF document text
    • https://bojowavezuzabi.weebly.com/uploads/1/3/1/3/131382797/pamuduf.pdfIn PDF document text
    • http://uablog.website/lodepalcvuki.pdfIn PDF document text
    • https://sabopedawexidix.weebly.com/uploads/1/3/4/3/134305122/gaparo.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/kakepexepam.pdfIn PDF document text
    • http://pufegusikozig.22web.org/benskydd_fotboll_g-_form.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/thomas_and_finney_calculus_solutions_slader.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukanebesiva.atwebpages.com/how_to_be_a_good_pastors_wife.pdfIn PDF document text
    • http://vagaxalelevirot.epizy.com/18381229631.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/free_printable_bible_word_search_puzzles_for_adults.pdfIn PDF document text
    • http://pewizofiwerobep.rf.gd/seximujosevabixavifig.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_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 5316 bytes
SHA-256: d57a78d9868ef70c506f50fbcbbbc680899fc955eda2b1b710496132e221c2dd
font_01_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 10852 bytes
SHA-256: b8438d2a12a2600fc8b7580f00b69734e681d6361035f573422e4e5d41fc9b7a

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