Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb52a9840a94d14…

MALICIOUS

PDF

71.4 KB Created: 2021-01-22 15:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2be0c26aaabef9f0581985f020f77081 SHA-1: 232bc5986c3146a8f7203bf3a8d16f4540058833 SHA-256: 5fb52a9840a94d144dc4b89d281c0a80115a7ac169c80cd4fe55f4ec49d76bf4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a 'Point estimate calculator ti-84', aligning with the lure of accessing external resources.

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://trafftec.ru/123?utm_term=point+estimate+calculator+ti-84 PDF link annotation
    • https://site-1174360.mozfiles.com/files/1174360/solaz.pdfIn PDF document text
    • http://kulokozataxat.22web.org/guided_imagery_scripts_audio.pdfIn PDF document text
    • https://site-1172896.mozfiles.com/files/1172896/tezofuvogorixu.pdfIn PDF document text
    • https://site-1237331.mozfiles.com/files/1237331/full_album_adele_25.pdfIn PDF document text
    • http://nusururak.22web.org/chenderit_6th_form.pdfIn PDF document text
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/242ea9ea0.pdfIn PDF document text
    • https://lusovajilabijix.weebly.com/uploads/1/3/5/3/135351537/5062459.pdfIn PDF document text
    • https://site-1173259.mozfiles.com/files/1173259/lojex.pdfIn PDF document text
    • https://site-1200721.mozfiles.com/files/1200721/funagopedaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fimageparoxa.rf.gd/gunaxukisoletowijolade.pdfIn PDF document text
    • http://pagupim.epizy.com/47341529636.pdfIn PDF document text
    • http://memajale.epizy.com/kugevisoxawubamowukapos.pdfIn PDF document text
    • http://nopizapokife.epizy.com/98465351502.pdfIn PDF document text
    • http://seladetitogar.epizy.com/91535301745.pdfIn PDF document text
    • http://gagelenobom.epizy.com/79037862037.pdfIn PDF document text
    • http://memajale.epizy.com/format_date_phpspreadsheet.pdfIn PDF document text
    • http://felawikemuda.epizy.com/you_say_run_piano_sheet_music.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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 5260 bytes
SHA-256: a5390ea6a30f19c2d781fa0cd39cd10a2d71de102cef290db71e4068e3057a7a
font_01_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 10660 bytes
SHA-256: 1e2a4beffbab0adf8afcb955d6331388e58b4554663314265aeee71f7903349d

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