Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff43e9283e3a78ab…

MALICIOUS

PDF

94.7 KB Created: 2021-03-06 16:17:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 788456273cbb41f3743a723ac539439c SHA-1: 293227b204e5dc53ced03da9cc52bef088d850bc SHA-256: ff43e9283e3a78ab2618bb1804b13ec7d42bb8b4f15af1e28b87c3a5b5034376
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to graphic design books, which is likely a pretext to drive users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=how+to+use+graphic+design+book PDF link annotation
    • https://mefirotevi.weebly.com/uploads/1/3/5/3/135314773/1870972.pdfIn PDF document text
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/6623642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456378/normal_60315e8ea3f3c.pdfIn PDF document text
    • http://poxexududojal.66ghz.com/comma_splice_grammar_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/Qggxeii/jimotufomukaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5fe1c348c4efe.pdfIn PDF document text
    • https://renokiva.weebly.com/uploads/1/3/4/3/134353994/segag.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/iiTIjgy/30511173840.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/aR5gfjd/parents_kit_app_erfahrungen.pdfIn PDF document text
    • https://kilobabax.weebly.com/uploads/1/3/1/8/131856311/bededorenifu_jugiruduru_vuvixudefize.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/hijUhaL/how_to_make_origami_crane_instructions.pdfIn PDF document text
    • http://tasefuvakol.22web.org/antrenmanlarla_matematik_4_zmleri.pdfIn PDF document text
    • https://zavowajasobi.weebly.com/uploads/1/3/1/4/131406950/b194a.pdfIn PDF document text
    • https://cdn.sqhk.co/jadidawa/fggdjfg/77696053420.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vomifavub.epizy.com/73530406756.pdfIn PDF document text
    • http://vubefezit.rf.gd/famobojanobatigiji.pdfIn PDF document text
    • http://fufagarafe.epizy.com/7572219099.pdfIn PDF document text
    • http://xubaforan.epizy.com/22912406070.pdfIn PDF document text
    • http://sukowinom.rf.gd/totisataz.pdfIn PDF document text
    • http://gejujebiwibi.epizy.com/video_converter_software_free_full_version.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_off000133ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CA 5560 bytes
SHA-256: a9c74df5fd54585dd2bc2e0b39521190058557334bf9852aae4f4920f08e12b4
font_01_sfnt_off000146b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B4 11640 bytes
SHA-256: eed8ad30787c0888ed9d7e1144889e724b916278f810a4ef0c05dc0094da485d

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