Malicious PDF — malware analysis report

Static analysis result for SHA-256 5892ccca2ffaf16d…

MALICIOUS

PDF

77.7 KB Created: 2021-04-10 00:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eec0cef0702314a6efeb841179afc4f5 SHA-1: 7952649537d0d973ff1ead4c72a6e9cecf5b2116 SHA-256: 5892ccca2ffaf16da56e95cf20a3528e22bd341fec0deac45a0ad28adb7408e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily corrupted, contains text related to 'managing time during competitive exams', likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=how+to+manage+time+during+competitive+exams PDF link annotation
    • https://cdn.sqhk.co/nisikevepoxi/ionUajd/purisugi.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/RS4gijj/f1_mobile_racing_download_mod_apk.pdfIn PDF document text
    • http://netlysy.online/12807876128ee03g.pdfIn PDF document text
    • http://construt.site/nerimevojikiduwikixif2cq4m.pdfIn PDF document text
    • https://cdn.sqhk.co/xawowatu/hbmjaia/kexaxuturebolowudubiwawa.pdfIn PDF document text
    • http://polibesafonujof.iblogger.org/ranijepoligavonani.pdfIn PDF document text
    • http://smotrikino.fun/powikiwavok72tyn.pdfIn PDF document text
    • http://slimerecipe.org/78594840186pzxt7.pdfIn PDF document text
    • http://pipazodonuwadu.iblogger.org/descendants_3_book_report.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/giifTFK/marooned_on_an_island.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/taguxif/veletodeju.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_0fdc8f24b79c4f5b9af8c9f2841f2f4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/psicologia_anormal_libro.pdfIn PDF document text
    • http://dataluwemijelo.epizy.com/breach_of_trust.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_45e77deec8564a14a465384e8aa90997.pdf?index=trueIn PDF document text
    • http://sakodaletop.rf.gd/71271332415.pdfIn PDF document text
    • http://ximigatoma.rf.gd/effects_of_noise_in_communication_process.pdfIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_82fadf8eb59a454bb84f6b23fa432090.pdf?index=trueIn PDF document text
    • http://jivuwenidupilu.rf.gd/mofotozi.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_00164b8c77744a7299c9a1d5096c9135.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/banose.pdfIn PDF document text
    • http://wagesasalep.rf.gd/carbon_cycle_process.pdfIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_4bcfa3a99f384edea1f5aad9ac4a17fa.pdf?index=trueIn 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_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 5540 bytes
SHA-256: 9d22d32af28dba5a07487a46519befb67aa17f71e2e9ebf5b156a397a1a1954d
font_01_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 10296 bytes
SHA-256: 18c0412bcb38fd0b7cd2d65c8ca0b838e23055e9757535dc23c8e03495d3b62c

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