Malicious PDF — malware analysis report

Static analysis result for SHA-256 e163d8b82056a19f…

MALICIOUS

PDF

165.2 KB Created: 2020-12-22 02:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 041952e287cb66a6c0ec6cac66bb442e SHA-1: be8ce5fddc4e26e7929c831ca2c2f029e1fedd31 SHA-256: e163d8b82056a19f694ca7f292b58774b601b461bf31198b89d2e1b70712a92c
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious infrastructure, identified by multiple heuristics as a redirector for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=hockey+stick+graph+meaning In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5fb9c400bd38d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5f8b655f92535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f893d7eaa9ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8155947a-0cee-4322-a902-2bbe23782595/78180286031.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4de60ff13940aa258fcf0/t/5fcff8c7055cc35c686afc2f/1607465161799/screaming_bird_at_night_brisbane.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/ledewu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/6358862593.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/teoria_de_skinner_y_el_autocontrol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a27cc1-b5bb-4eb4-a20b-8c22dbcdd5e9/cuddeback_f2-20_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/bts_answer_love_myself_lyrics_hangul.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc79c85e71df64d6bd9c29/t/5fdccc0957b8971cd7a8e40e/1608305673866/louisiana_sales_tax_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/gamibanufu.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 2

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_off00024bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24BBB 5444 bytes
SHA-256: 474e484c26ae840c43ad332ee9f626b151e9ef8b9fbc658a4de621bb5c15fe3c
font_01_sfnt_off00025e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E27 12980 bytes
SHA-256: 3a174e78e64f08bf0334c50c162dfeba2dbbe63565b2376603d46d2992001e07

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