Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fdd29ff46469a8…

MALICIOUS

PDF

71.9 KB Created: 2021-01-20 01:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d4078e9967b85c1d18842cd7f5a5df0b SHA-1: 914ad07763e6592f42c6df633a1813d1390e6626 SHA-256: e0fdd29ff46469a8ef8df1f871c456e3bb455535d29bb08fe8935c747edb94cb
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or distribution mechanism. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

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
  • 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.
  • 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://seumenha.ru/123?utm_term=2012+multiple+choice+ap+calculus+ab+answers PDF link annotation
    • https://zukudanasoxe.weebly.com/uploads/1/3/2/8/132815154/mofug.pdfIn PDF document text
    • https://zetovesejideze.weebly.com/uploads/1/3/1/4/131482946/9949486.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/4008336.pdfIn PDF document text
    • https://site-1246486.mozfiles.com/files/1246486/7602039539.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/0e9cd834433b1f9.pdfIn PDF document text
    • https://site-1176201.mozfiles.com/files/1176201/15050985277.pdfIn PDF document text
    • https://site-1172834.mozfiles.com/files/1172834/pixel_gun_warfare_zombie_attack.pdfIn PDF document text
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/ce80e338241754.pdfIn PDF document text
    • https://kofuwirobunugob.weebly.com/uploads/1/3/4/3/134318534/ce20dd5b41.pdfIn PDF document text
    • http://fodokimi.22web.org/aludecor_acp_sheet_dealers_in_chennai.pdfIn PDF document text
    • https://nupebovewurezo.weebly.com/uploads/1/3/2/7/132710783/e5bd992f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wavunot/is_dhgate_legit_website.pdfIn PDF document text
    • http://suvumudupese.epizy.com/41265151705.pdfIn PDF document text
    • http://sosodif.rf.gd/89498064149.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/picklefest_2019_cleveland.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/54926263458.pdfIn PDF document text
    • http://gugakalorezo.epizy.com/60687269762.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/26049375930.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/75929351947.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_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 5636 bytes
SHA-256: 8005955960faf0c5c40614aa774fff63db6328aceef975576f38c9a5daa42eb7
font_01_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 11128 bytes
SHA-256: 0108f3115cbdfeb75add2be94417c3006abfb1ca253b9e96a353ec9c12d44dd0

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