Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfeb9ebdd4a98c38…

MALICIOUS

PDF

76.7 KB Created: 2021-02-15 11:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3bad5208889e2c76b228ca022190efcd SHA-1: de6340532dc6a761861cc603388f31e04ef9f6de SHA-256: dfeb9ebdd4a98c380c6fa420c2eadf2ceea92c2e2896de225503cb9f93bd8f67
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous embedded URLs designed to redirect users. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/strik?utm_term=rib+tips+masterbuilt+electric+smoker PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486775/normal_5fdd0b373eef4.pdfIn PDF document text
    • https://cdn.sqhk.co/todusukiraxi/YbO3n5T/wolf_craft_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/nodomepe/Fiagd2l/22775659059.pdfIn PDF document text
    • http://bigchance.pw/dancing_cube_apk087ck.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450730/normal_5fc8fb0e18bdc.pdfIn PDF document text
    • http://arbitestpark.xyz/7651050270v6v44.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/cieieij/97924733874.pdfIn PDF document text
    • https://cdn.sqhk.co/bulenupulabo/hfjiWjb/vopagitomuvapid.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/jqacFhf/48590460154.pdfIn PDF document text
    • http://itabody.space/tukunegaginivumepowowajjdpgf.pdfIn PDF document text
    • http://clientesdkb.com/between_the_lines_lyrics_janis_ianxscha.pdfIn PDF document text
    • https://cdn.sqhk.co/denepepunuja/aiahagf/32291958648.pdfIn PDF document text
    • https://cdn.sqhk.co/tatomaxeriri/gdhdgcX/21542154889.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/hhhgcih/mandel_browser_premium_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_601384ecd953d.pdfIn PDF document text
    • http://alania365.ru/sl_saylarn_kuvvetleri_tablosu7j151.pdfIn PDF document text
    • http://accface.in/osmosis_and_diffusion_review_sheet228i9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492555/normal_5ffbf9737b43b.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/sugowubuf/instagram_photos_original_size.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_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 5288 bytes
SHA-256: 7d916af323930f86a225db344ad9a8715a71ec6e7e099066352a295d89ad8d78
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 11324 bytes
SHA-256: afda80c61d065beb00d3546500e3e3da6868fc036d8906c54b133018a6df5346

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