Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8483e582653926…

MALICIOUS

PDF

92.1 KB Created: 2021-05-18 01:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e9c290224fca1edda60a7fa81416461 SHA-1: 9493a557a0cf82f35295a73fb6c52eaf68cb674a SHA-256: df8483e58265392641e53af1a532940ff1a647dbf7f520566a9c375f7789b2e9
156 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 of which are SEO-optimized and point to PDF documents, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URL `https://jacksth.ru/strik?utm_term=what+are+the+subjects+in+bsc+1st+year` is likely the primary malicious destination, disguised as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=what+are+the+subjects+in+bsc+1st+year
    • https://static.s123-cdn-static.com/uploads/4415300/normal_600216fe1ce20.pdf
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/bikedesaxomijolekof.pdf
    • https://kavejujutafen.weebly.com/uploads/1/3/6/0/136022690/4101535.pdf
    • https://xokotenesuku.weebly.com/uploads/1/3/1/4/131438709/kafabomo.pdf
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fe0a58fca114.pdf
    • https://static.s123-cdn-static.com/uploads/4387427/normal_6003091b1ea99.pdf
    • https://cdn-cms.f-static.net/uploads/4426955/normal_601f22c5889f0.pdf
    • https://cdn-cms.f-static.net/uploads/4486200/normal_606a53563f6f1.pdf
    • https://kaxuzemerufo.weebly.com/uploads/1/3/0/7/130775382/fexivaposev.pdf
    • https://sojezuzifoko.weebly.com/uploads/1/3/0/7/130775518/bimozavo_runidegaw.pdf
    • https://cdn-cms.f-static.net/uploads/4411919/normal_6027377ac66c2.pdf
    • https://zasipirowi.weebly.com/uploads/1/3/4/2/134266189/kopokelex.pdf
    • https://static.s123-cdn-static.com/uploads/4452612/normal_5ff51fea872f6.pdf
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/8589824.pdf
    • http://lusowifivixava.iblogger.org/lenojidunis.pdf
    • https://cdn-cms.f-static.net/uploads/4450509/normal_6026325873e68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/semuxemakaw/addison_wesley_longman_math_worksheets.pdf
    • http://juzuruwe.rf.gd/692246092.pdf
    • https://s3.amazonaws.com/leteraxewe/cnbc_market_guide.pdf
    • http://luvoxijamubisur.rf.gd/36588817287.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f780.bin
a2f48c21e99c8ad8217816893532fe1def6d0960908769be0c582bc8d0923157		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 5236 bytes
font_01_sfnt_off00010966.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 3720 bytes
font_02_sfnt_off000114c9.bin
c4c96e45456ffa45c3d755266eea24ff419cf4a30dbaa574fd2d04bb6aedcf9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C9 10868 bytes
font_03_sfnt_off00013a05.bin
eda34e89fa0567482b60a995f97788bc578067ed73b836957836e0872161173f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A05 13876 bytes

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