Malicious PDF — malware analysis report

Static analysis result for SHA-256 685c4b7402d2e6a3…

MALICIOUS

PDF

83.8 KB Created: 2021-06-06 05:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ec0cf7b4a5dbf4be18b681f89928098 SHA-1: c9170184dbba5286f923c523d31be0c58745b4cb SHA-256: 685c4b7402d2e6a39272ef973963e0c9ec9cc41e4f5b76c30d33d879f0e255df
126 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, identified as a link farm on disposable hosting. This suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via a link. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://inwebjor.ru/pbw?utm_term=download+dumpper+and+jumpstart+full+version
    • https://puzagetidorijes.weebly.com/uploads/1/3/4/4/134495880/xusubaxekidozu.pdf
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/dobejejali-novawazoz.pdf
    • https://gipudakewisuvu.weebly.com/uploads/1/3/4/6/134665668/nexopo.pdf
    • https://jatazuleb.weebly.com/uploads/1/3/4/6/134662889/sipiwulamovivox.pdf
    • https://cdn-cms.f-static.net/uploads/4402936/normal_6044daba51db3.pdf
    • https://nasaxedinevizuv.weebly.com/uploads/1/3/4/7/134759800/7947374.pdf
    • https://cdn-cms.f-static.net/uploads/4379487/normal_602f82970e0df.pdf
    • https://cdn-cms.f-static.net/uploads/4450864/normal_60367d05f2ba5.pdf
    • https://cdn-cms.f-static.net/uploads/4375075/normal_60183e4590d48.pdf
    • https://duzajitoji.weebly.com/uploads/1/3/2/6/132680922/dugudezorerifu-jodenidagita-dakuloxabibufug.pdf
    • https://kuwiliwal.weebly.com/uploads/1/3/1/3/131378779/8b031c61f5f.pdf
    • https://cdn-cms.f-static.net/uploads/4393515/normal_6068e7540803c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/07a7d3f1-6965-406e-8400-9bc9ddd314e6/kateropufijofixapuxodozon.pdf
    • http://xumefosux.pbworks.com/w/file/fetch/144579603/90981973761.pdf
    • http://jananevava.pbworks.com/w/file/fetch/144702972/how_to_identify_chromecast_photos.pdf
    • https://uploads.strikinglycdn.com/files/d9420cd6-aff7-49d7-939b-19a203543f89/lemenib.pdf
    • https://uploads.strikinglycdn.com/files/be585179-0e75-4a85-8957-1105070996eb/invisible_man_2020_rotten_tomatoes.pdf
    • https://uploads.strikinglycdn.com/files/6753891b-59a1-4346-9c96-365775448f97/soc_3_nijole_benokraitis.pdf
    • http://lerepaxa.pbworks.com/f/73855850000.pdf
    • http://mejigulo.pbworks.com/w/file/fetch/144602901/microbiology_by_michael_j_pelczar_download.pdf
    • http://nugewil.pbworks.com/w/file/fetch/144612606/rowisujekemedonud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1f.bin
5217a993ac099563b204dcf00f052cb794a244d68ddf60262a225781c1158ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 5412 bytes
font_01_sfnt_off00010094.bin
55e1286cb9c3baea0bb56dc75977c0bb46fe31a920d05acc873b345fd0a15f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 12208 bytes
font_02_sfnt_off00012823.bin
813604a1ffb804e26426833fe200d575f0d3c59f2dac49ce34fe75348713a7ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 17148 bytes

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