Malicious PDF — malware analysis report

Static analysis result for SHA-256 e503833155d2b039…

MALICIOUS

PDF

75.8 KB Created: 2021-02-25 22:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 047570f4f907755bd69ecfb7d63ab1ff SHA-1: 4cb87719107620f7c402ec04037fcd4183c24929 SHA-256: e503833155d2b0397e9bd61da8be96a9d3acc157749528ea277bb42bc94f42e9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to exploit user interaction to visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wix?keyword=oops+i+did+it+again+karaoke+mp3 PDF link annotation
    • https://vilofezilo.weebly.com/uploads/1/3/0/7/130740065/2967041.pdfIn PDF document text
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/201530.pdfIn PDF document text
    • http://nuvifufaronez.22web.org/would_like_to_inform_you_all_that.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_5fea3c9f6c816.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/hhghahc/citadel_colour_app_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_60330b87192f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_601aa80e45717.pdfIn PDF document text
    • http://smallita.space/hd_movies_hub_300mblz4ko.pdfIn PDF document text
    • http://startbastar.online/stedmans_medical_dictionary_28th_edition_free_downloadt76pc.pdfIn PDF document text
    • https://sigurapefudaji.weebly.com/uploads/1/3/4/5/134576843/3bd1f29f2c4b.pdfIn PDF document text
    • http://vizionsmc.net/denakerodubuzemozolhdw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_602493beb519a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimigep.rf.gd/will_there_be_another_twilight_book_or_movie_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/iron_man_wallpaper_4k.pdfIn PDF document text
    • http://ligunatiresid.epizy.com/37904538726.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://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_off0000cc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 5500 bytes
SHA-256: 6ce0457953b5c2011212ffc7c683004548f5e8d91287fafacd51132336df74b1
font_01_sfnt_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 14440 bytes
SHA-256: 0e9d756ae589cdf6c0032f84b288ab0d91111cc7e936c9574cc268a307699e2d
font_02_sfnt_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 16368 bytes
SHA-256: 552e926f59ef53231249b6015cc51882b512f7a40c6b17c25f707dc25a221893

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