Malicious PDF — malware analysis report

Static analysis result for SHA-256 badea03c2e1a581d…

MALICIOUS

PDF

65.8 KB Created: 2021-01-14 04:14:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b7963946e219dd1bcbd15c304761efff SHA-1: b653345cd927c538933991845cc1580f07a34cbd SHA-256: badea03c2e1a581d90bb931d1aa563433122cb50b69abc6603df25da5bd1bfb5
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector leading to a lure for 'ti nspire student software license number keygen'. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, pointing towards phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

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.
  • 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.
  • 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://traffking.ru/123?utm_term=ti+nspire+student+software+license+number+keygen In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5fa8d0e212754.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376609/normal_5fc916238b44e.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/1jf3lyy/kabize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_5fad290fdc95a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463006/normal_5fd1b6e62d76c.pdfIn PDF document text
    • https://jubitire.weebly.com/uploads/1/3/4/0/134017652/f166ff.pdfIn PDF document text
    • https://retibome.weebly.com/uploads/1/3/4/6/134680472/lomotijepajatodebot.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/gJLjagc/kavabolapatogopogeri.pdfIn PDF document text
    • https://site-1194286.mozfiles.com/files/1194286/hack_killer_bean_unleashed_game_download.pdfIn PDF document text
    • https://wisufisuzok.weebly.com/uploads/1/3/1/3/131383924/4663eeb8.pdfIn PDF document text
    • https://bexobejunoguwed.weebly.com/uploads/1/3/0/7/130775871/485d05ae3e.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/damerirazib/vutejitabeluvelizosebiz.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EE 5824 bytes
SHA-256: 3028eda87dcf4f1f65d9d091016d433d9a22f76830daa7099f0dfbde4d4268de
font_01_sfnt_off0000ccbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBC 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 10016 bytes
SHA-256: 6412928b3c6e74e9fbe5fb128f2ef49a4caeb667dee10ea6d0dea40e82d77c77

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