Malicious PDF — malware analysis report

Static analysis result for SHA-256 21aa5ed996f0055f…

MALICIOUS

PDF

69.7 KB Created: 2021-02-27 11:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bb19d945ded0d03719cc37dd3f0bbe5f SHA-1: d7c598fbcca6f5869664b1309f64745cc62fcaf5 SHA-256: 21aa5ed996f0055f1e81a0d8e3d73266d08436fc2f640800ad57d837de404382
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-severity ML classifier and ClamAV, indicating malicious content. The presence of an external URI and an SEO redirector link suggests a phishing or malware distribution attempt, likely disguised as a helpful document. No scripts were extracted, but the PDF structure itself contains malicious elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/123?utm_term=how+to+turn+on+samsung+monitor+without+remote PDF link annotation
    • https://molireju.weebly.com/uploads/1/3/4/6/134630509/cbab4a349c8e.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/7khgBU3/entrepreneurship_development_and_communication_skills_ppt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_601aeff1dd186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_602e8929e78d6.pdfIn PDF document text
    • http://mefizilexofe.66ghz.com/jalapeno_cheese_bread_nutrition_information.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5fd8fc0e7c8d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_600e70afa5828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426060/normal_60143ba5aa331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384652/normal_5fddf9054909c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6036c9cd6456a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baniteb.epizy.com/49340754957.pdfIn PDF document text
    • http://nowozogep.epizy.com/adagio_albinoni_flute_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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38D 5120 bytes
SHA-256: 85fa5832f427db6ea9a906c49423591c3b1f2c5b80f84de9a3737f1d3c47a5d3
font_01_sfnt_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 11108 bytes
SHA-256: 6c3fa59c8e7e7e0708f80b21c6828bd85e2c5469e3ce89beabe3dada7e0f6255

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