Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6b4078e7cda608…

MALICIOUS

PDF

92.6 KB Created: 2021-09-12 20:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2784803b9718f4def520f060469d8f34 SHA-1: 383d53fca677be63a8496d5cc55527842248b739 SHA-256: 2a6b4078e7cda60862735af1932a8e0a739455952194f60ee9a7122ed9e27371
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to potentially malicious or disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL distribution align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://flyingkirin.com/uploadfiles/file/08192257528.pdf In PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/wulamikofolizosopedutadit.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/48627164056.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/seburimafimowumu.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/28855617193.pdfIn PDF document text
    • https://laps.pl/userfiles/file/mirolafuxivirile.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/jusugekodoze.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/jadizubute.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210909064834.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/42293799964.pdfIn PDF document text
    • https://marosme.ro/hirek/file/zerexeluxumedizas.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/xixemofojebus.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/dugorosuzorowima.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161346c89afb95---vetefoked.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/vudutamijuvakikize.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/3160258632.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-12/20210912230020713753.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/rawivimodepajosipibavela.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/vemuxixegi.pdfIn PDF document text
    • http://snft.ro/media/file/41160054349.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/xuvofojupidosisefoder.pdfIn PDF document text
    • https://pecsikult.hu/files/file/76459765971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=colors+tv+tamil+serials+list+2021PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 10556 bytes
SHA-256: c791b7f08962cb7357d0372493fb9bfb7e4279d194cb21582f6326cdf7762629
font_01_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BB 19020 bytes
SHA-256: 7741271dd4f64b03263156fc272c732aaea2c61b26d7673f7ebbc9399fe33dc3

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