Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7f3898a8bf1ae1…

MALICIOUS

PDF

82.0 KB Created: 2021-04-06 23:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 401eb871355eb18f3545248852cfc449 SHA-1: 55b72746b26aea25a9ca325bee6ab223851e6e06 SHA-256: 3f7f3898a8bf1ae1da369cf2ba81808cfbc2a99ae742f133c8d0742ecde2cef0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign PDFs, but one suspicious URL (vilenefex.ru) is present. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a potential SEO manipulation or content distribution scheme. ClamAV also detected this as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of external links and the phishing detection strongly suggest malicious intent, likely to redirect users to a compromised site or phishing page.

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 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://vilenefex.ru/strik?utm_term=cobra+microtalk+121+privacy+codes+range PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445882/normal_5fdaaf672172f.pdfIn PDF document text
    • http://taxunijunor.iblogger.org/loxevub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382631/normal_5fcbaaf8cce54.pdfIn PDF document text
    • http://pugopumonerab.22web.org/how_to_pray_an_intercessory_prayer.pdfIn PDF document text
    • http://doxisolawasusig.66ghz.com/aura_libro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421461/normal_5febee1be07e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_6046b61ecb200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_605e193fbc639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_602ee06048c1d.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/wopari/bter_rechecking_form_last_date.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/difor.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/51208705921.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_3a536883396b4e0181d5887c5d9a6628.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/elvis_presley_hound_dog_sheet_music.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_35f3825f43614104833c67cc5d25bbef.pdf?index=trueIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_45b9a4a09dfd4aa6ac151acce8865a02.pdf?index=trueIn PDF document text
    • http://kowisefofob.epizy.com/lizovovefalafekifepaxeno.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/licsw_massachusetts_study_guide.pdfIn PDF document text
    • http://rixijine.rf.gd/wallpaper_desktop_3d.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/84574217295.pdfIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_274e973ee53344ca9bbb1fdcea8479c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gudukupir/bevipuxasitedi.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_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 5848 bytes
SHA-256: cfb6c325ee3a7163635789ab1c6517a04e9262a5dfdf301689465eea4b40783b
font_01_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 11580 bytes
SHA-256: 6b74f8069d0f0df27fd030d6ba626b5b4735d6b8af686bfedd17e85279df239f

Open this report in the interactive analyzer, or submit your own file for analysis.