Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5e31e1e5c7a80c…

MALICIOUS

PDF

74.6 KB Created: 2021-02-23 07:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 60e3e18eb3ca6c86a7eb383191e91dbb SHA-1: 7a2d74b14e206e811de239ed0e331a9f2b07edbd SHA-256: 5f5e31e1e5c7a80c2db9833be9df7c4a08e1c1fc9179725fd71b0ff52b00bf05
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/strik?utm_term=google+search+pictures+resolution PDF link annotation
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/db033f5b75a.pdfIn PDF document text
    • https://kaxukododeregoz.weebly.com/uploads/1/3/0/9/130969338/1aa0ba66bd.pdfIn PDF document text
    • https://lujiwosibe.weebly.com/uploads/1/3/4/0/134040634/ronujepufafiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480591/normal_5fe51dc7006a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_6027be9d1ed12.pdfIn PDF document text
    • https://kepefiporewe.weebly.com/uploads/1/3/4/7/134704647/revujivenoxuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489583/normal_601ecb285eeda.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/5308928.pdfIn PDF document text
    • http://hytri.com/refarexaposutijikamifuvevbzo1.pdfIn PDF document text
    • http://slamelina.website/wallpaper_ben_10_alien_force2tq3s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_602ef3b95efa4.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/2d5cc60d076154d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://potovoz.rf.gd/98573821995.pdfIn PDF document text
    • http://ganakakene.epizy.com/chesapeake_bay_tunnel_fishing_report.pdfIn PDF document text
    • http://xevunikusixed.rf.gd/zusufawipivin.pdfIn PDF document text
    • http://zixoridepub.rf.gd/tejokobix.pdfIn PDF document text
    • http://mufozugiro.rf.gd/how_much_does_a_1997_honda_shadow_1100_weight.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_off0000d21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21A 5228 bytes
SHA-256: 367d40dbaec37e6a04e14df5349101164671097da3e9e1535cfe1e9eb9cc0020
font_01_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 10384 bytes
SHA-256: cf2be9c2cd9f3cb7131afabd35bd9ba4833174b2f85f7a4b679cd581201d450f
font_02_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 16240 bytes
SHA-256: 20dc887637f87c60f5f5f032b59006863323ddce3c1824f915f0414447b058c1

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