Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f5d665a19ee079…

MALICIOUS

PDF

82.3 KB Created: 2021-03-18 20:12:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 419c6bd50d8a0937a9c3b77f5128310a SHA-1: b95fdf3a779d65acbec142ce26b7693944a6b225 SHA-256: 48f5d665a19ee07984771d5b2dfe58637e87ae497e4642d2096a74b77ca7e074
186 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 disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=how+to+renew+your+learner%2527s+permit+in+md PDF link annotation
    • https://cdn.sqhk.co/baresupujar/jfjfb5T/61641210134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_60222c6f28348.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/jjjihcg/58751533708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_600bbb22e43de.pdfIn PDF document text
    • http://4bochki.ru/litenh2s71.pdfIn PDF document text
    • http://monoga.space/free_catholic_saints_worksheetsnpo67.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/jiiSiex/best_month_to_snow_ski_in_colorado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5fd7b01601529.pdfIn PDF document text
    • https://vitekasawo.weebly.com/uploads/1/3/4/4/134456264/pefudezekozuf-kewikixuxel-vafumana-zanisikeguvar.pdfIn PDF document text
    • http://xubajaw.iblogger.org/ruledaxifapidomapaduwed.pdfIn PDF document text
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/vitusa_pimugeraw.pdfIn PDF document text
    • https://cdn.sqhk.co/medijamowole/3yjaMFD/color_changing_wallpaper_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxatotukaru/Dvhegcz/walubeledubukotoxo.pdfIn PDF document text
    • https://dalokagamamis.weebly.com/uploads/1/3/4/6/134695183/porigawogomajijifeza.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/8wYj7gd/run_hulu_parents_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/uibvZBb/wells_fargo_mobile_app_login.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_5fec22fcdfdea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tedijafubivot.epizy.com/90565332228.pdfIn PDF document text
    • http://vapodizasogore.epizy.com/adding_and_subtracting_polynomials_guided_notes.pdfIn PDF document text
    • http://gibapomidumitar.rf.gd/is_true_detective_on_netflix_or_hulu.pdfIn PDF document text
    • http://witosef.rf.gd/55551244229.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 3612 bytes
SHA-256: 3573eafd31c1906a2d841e8383e76630ab801fdac3c685f3c9cfb4f4fee2cda5
font_01_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 5176 bytes
SHA-256: af06fb754a1dfc62a866eeb16b36c7b84b93ccf7b17f762707cb394d617ea1c1
font_02_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 11972 bytes
SHA-256: ef1c8f84f909794932243907afe33ffafc3f1e28c6bb957732b8ad1a7a1d223e
font_03_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f