Malicious PDF — malware analysis report

Static analysis result for SHA-256 4476cf3a7170fc41…

MALICIOUS

PDF

74.7 KB Created: 2021-02-26 02:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6164f8e662e8c08b203675b26e625742 SHA-1: ddf5983fc806f3fa4b8ddaabcdd99c52a5fa71f9 SHA-256: 4476cf3a7170fc4187f0b9e42369563b12d6bcb7c796eea8ecbb29be5509bfdc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, contains text related to product searches, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jottigo.ru/award?keyword=how+much+money+is+a+ps4+on+amazon PDF link annotation
    • http://confirmyourverifiedbadge.com/fivenad1ifq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5fdc79753906a.pdfIn PDF document text
    • http://bitcoins-profits.com/275966843493m5t3.pdfIn PDF document text
    • http://minuette.me/vishnu_sahasranamam_video_with_telug0ycqc.pdfIn PDF document text
    • http://italdom.fun/hazop_reportzosiu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5fd66732bff78.pdfIn PDF document text
    • http://chelamela.org/fancybox_package_latex2bk8g.pdfIn PDF document text
    • http://podcard2020.site/9658263780191w6t.pdfIn PDF document text
    • http://remawunusubo.22web.org/walter_riso_amar_o_depender_libro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jobavo/kubobupitazijika.pdfIn PDF document text
    • http://fusogusobu.epizy.com/dazufuvof.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/kujurom.pdfIn PDF document text
    • http://telewazikenap.rf.gd/61471512180.pdfIn PDF document text
    • http://livajurusurex.epizy.com/alfabet_angielski_dla_dzieci.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/foxinitevogowakopojunek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 5140 bytes
SHA-256: ea0263bc71ac23c981f01f1ea78ddb317f124009fb3f60367be632880a16743b
font_01_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 10472 bytes
SHA-256: 07cdb88fb987096b953e5f4cde921fe9a631037122109b5dc8d7f9a3ec9fc245
font_02_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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