Malicious PDF — malware analysis report

Static analysis result for SHA-256 513e31bdc31fa42a…

MALICIOUS

PDF

81.4 KB Created: 2021-10-18 05:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b8eb78fa06c70f7b9b7a0cb36b4c6847 SHA-1: 63ca24ab3f64f836ebe58045de5299688c86906b SHA-256: 513e31bdc31fa42a0f479f685fcca555b4a9795efaa542b6879516f33e4faffc
126 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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 http://krallarintavugu.com/upload/file/lewedumuramomadobosalam.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/givitojelovusuvujesewusa.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/kugunovotudajogixas.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/61159224278.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/85584606449.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/44653134121.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/19463928169.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4809db55---32130757564.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/24995130641.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/12413606594.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/pasevenonuziditiguto.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/23041989456.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/nipasu.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/rorutibiwol.pdfIn PDF document text
    • http://4rrecycle.com/files/file/nonolituvuvodavivofebesu.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/rigifovebafuwuzidefe.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/28745366527.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/67431523278.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/42970236583.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/2708238599.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/luvorewoderabuki.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RhDyTiV0TgQ/uplcv?utm_term=story+of+a+rich+man+in+the+biblePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 19064 bytes
SHA-256: 520f905b2bbc717a2e585417f27d4bde041742c507f09ffc986e60b8024606d3
font_01_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 10760 bytes
SHA-256: 08cdce3711776aca39827ac2563013c8ceb4d2da5ca73b442bd40595eb0d9cc1
font_02_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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