Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c1ea7eb25892db…

MALICIOUS

PDF

70.6 KB Created: 2021-02-19 19:12:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d9683f7586a308adfb64a83c2f0df49b SHA-1: 8833ef0270d00237985303c2af629884996ecccf SHA-256: 33c1ea7eb25892db0d42e60253520ccb15ace3d6eee3503194e206452401a572
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, specifically identified as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, indicates a lure related to 'business letter format worksheet'. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to malicious 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://seumenha.ru/wix?keyword=business+letter+format+worksheet PDF link annotation
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/5244868.pdfIn PDF document text
    • http://xodawasolu.iblogger.org/roxatisamuxozafemewole.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/xirewa.pdfIn PDF document text
    • http://cabinetsop.xyz/how_to_treat_dark_hollow_eyesz3fu0.pdfIn PDF document text
    • http://misiliv.66ghz.com/blade_inductrix_pro_betaflight_settings.pdfIn PDF document text
    • http://mail-autoscout24.net/generos_periodisticos_cronica_noticia_reportaje_entrevistapy5xg.pdfIn PDF document text
    • https://tajaleder.weebly.com/uploads/1/3/5/3/135320318/9194282.pdfIn PDF document text
    • https://fajupumivut.weebly.com/uploads/1/3/4/1/134108914/5929183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_6016772a2c52a.pdfIn PDF document text
    • http://springital.fun/fesofaxuvatunufeburidbv2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_6016014a985b3.pdfIn PDF document text
    • http://timurberg.ru/moluvaboralixsn7z.pdfIn PDF document text
    • https://bodokevusigow.weebly.com/uploads/1/3/2/7/132740435/0dd2b00f8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gazivemon/sisesapitamaluka.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/venipit.pdfIn PDF document text
    • http://rufegojokod.epizy.com/fizigulunerosigiso.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/cannice_h3_manual.pdfIn PDF document text
    • http://gokixedotoj.epizy.com/tor_browser_mac_10._7._5.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_off0000d711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 5212 bytes
SHA-256: 36a6151575f57ce8dbb03ed44c80bd80d9dc7d78e10543ef2d7f91249af9c082
font_01_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 10580 bytes
SHA-256: a7679bd328c621f58493c41d486baeff565d7394f9f0ecd4edcddc3da36adfd5

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