Malicious PDF — malware analysis report

Static analysis result for SHA-256 c467909c395c08b0…

MALICIOUS

PDF

71.1 KB Created: 2021-02-14 16:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 37aea34295658d5025517bafcd2f13d6 SHA-1: 791c60f4774656f409f391f8c566352b21f22acf SHA-256: c467909c395c08b05ad5102eb35e84bb1b899fcd822b749aa3e6aa9c486323ad
184 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains or known redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL points to known malicious redirector infrastructure, and the ML classifier strongly flags this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to a book title, suggesting a phishing or malware distribution attempt.

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
  • 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://yafferge.ru/123?utm_term=principles+of+real+analysis+rudin+pdf In PDF document text
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/c4ec8f9d73765.pdfIn PDF document text
    • https://fumamefix.weebly.com/uploads/1/3/0/8/130873833/4a394764bc17d00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421474/normal_5fdf89c54d07c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371524/normal_5ffc0e2ba0bcd.pdfIn PDF document text
    • http://vifofumimugeke.22web.org/gaming_twitter_header_template.pdfIn PDF document text
    • https://nezopubetuw.weebly.com/uploads/1/3/2/6/132681339/9c8b96274b81f0.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/7302982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383798/normal_60005ef40a34b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xeroxofebamuwu.rf.gd/xaroligafekiw.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/indian_accounting_standard_14.pdfIn PDF document text
    • http://lexepetilak.rf.gd/vazosutanivusajeleripijod.pdfIn PDF document text
    • http://wobagufiri.rf.gd/insyde_bios_update.pdfIn PDF document text
    • http://xiwaresijo.epizy.com/holy_rosary_sunday_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/angry_birds_2_full_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/free_joint_property_ownership_agreement_template_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/59883381733.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_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 5252 bytes
SHA-256: 5bc90d7943deb1c068061c68359a8e0077a874ee73f7bcd52676b133cf82d767
font_01_sfnt_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 11828 bytes
SHA-256: fc085ecdefdf7a8ca0474c1c536261a8b0bfd8ba1e5bab62f7cac54ecab50567

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