Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8d3d5634a43e52…

MALICIOUS

PDF

81.2 KB Created: 2021-04-03 17:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfbcc74844cd454225085b20c61764a6 SHA-1: d520380b268f9c4c71ddf3b91e85e289972e6274 SHA-256: aa8d3d5634a43e52f4c9e529f4edfbedda46227f037371db374fc0f9ca17d285
136 Risk Score

Malware Insights

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

The PDF document contains a lure related to network device credentials, directing the user to a suspicious URL. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or credential harvesting. The presence of embedded URLs and the nature of the heuristic firings suggest this document is part of a phishing campaign, potentially using a password-protected archive lure to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kuzutuzo.ru/strik?utm_term=what+is+tp+link+default+username+and+password
    • https://xexunejakex.weebly.com/uploads/1/3/4/2/134266262/6c1dd3e9f.pdf
    • https://static.s123-cdn-static.com/uploads/4492555/normal_5ffe5fc19750a.pdf
    • http://tryici.xyz/how_to_find_the_year_on_a_kawasaki_bayou_300519xr.pdf
    • https://latuxuxapeja.weebly.com/uploads/1/3/0/7/130739017/nituzu.pdf
    • https://static.s123-cdn-static.com/uploads/4428069/normal_5fcd30ef581bf.pdf
    • http://lopozodedawap.22web.org/limopu.pdf
    • http://doxisolawasusig.66ghz.com/ninadagajopafeso.pdf
    • http://ipoteka.net/mumedunezopunovikivodowhkt6.pdf
    • https://cdn-cms.f-static.net/uploads/4475194/normal_603a98204167b.pdf
    • http://domsale.xyz/egyptian_gnostics44zyk.pdf
    • http://on24-system.club/xanogonujutomptfry.pdf
    • https://jenosexafunira.weebly.com/uploads/1/3/4/6/134686035/kaniref.pdf
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/ximuw.pdf
    • https://static.s123-cdn-static.com/uploads/4388048/normal_60095e46d55a9.pdf
    • http://wesused.22web.org/how_to_reset_westell_7500_router.pdf
    • https://milanesove.weebly.com/uploads/1/3/1/3/131383497/nudubobekis_zexujumufodupe_xomaxusivixi_domogut.pdf
    • https://static.s123-cdn-static.com/uploads/4489237/normal_6006b87a4ba32.pdf
    • https://bixizevabusiku.weebly.com/uploads/1/3/4/4/134403351/bakejijararuvifazujo.pdf
    • https://bezatawe.weebly.com/uploads/1/3/0/9/130968967/tulazazerekalez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tagowavez.epizy.com/takuzunajozazededadinaru.pdf
    • http://gelutusuxipedib.rf.gd/dajugafefiwaxefoni.pdf
    • http://mikugux.rf.gd/27611268021.pdf
    • http://midejoxujonaler.rf.gd/29407799104.pdf
    • http://migumirokive.epizy.com/does_bully_dog_gt_tuner_work.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed6.bin
9a1fc7e15bd4cf406fe758bf353ef9fda3f5ddacdbe4c12a670063cf26b304b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 5448 bytes
font_01_sfnt_off00010142.bin
2d1c02d7faeb7dad5af5d103f135926a0d4fd4e69f3a7da8959d46cf8e88466d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 3120 bytes
font_02_sfnt_off00010dc5.bin
4c9e63fd5c2f7bf45413b2b0d18774feb8d535188bc116c431feec3063bcffad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 11536 bytes

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