Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf25a42ca418101…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 21:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 277882eeb9d6571a5b55b189eec0a840 SHA-1: 75f54167910428bb2dca42dd523950d8759347ee SHA-256: bdf25a42ca4181018bc3e13bc0de1f4116134c61653d98a3ca3aa45fb14654f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=wifi+repeater+apk+pro PDF link annotation
    • https://art4you.sk/editor_uploads/system/files/mulamanubuv.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/60649745169.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161373ee33456e---98521127073.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/77134351106.pdfIn PDF document text
    • https://umartravel.com/files/xizodekijifoteguxusij.pdfIn PDF document text
    • http://protok.pro/upload/files/paxuronewovedurinerev.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/nuxoketikisekikotuxezexi.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/jisusasebapatev.pdfIn PDF document text
    • http://exosushi.com/uploads/files/mudixuposoru.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/50302567449.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/11051834527.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/23156378297.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vesasuvuxebegajikanelo.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/31108543250.pdfIn PDF document text
    • https://fratellifurloni.it/file/96820442465.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/6633732716.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/26931252938.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f2b83c02a4894418dce7370b62d7034d/10528684461.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/legulinovezarenawovo.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/26421699090.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/70465112043.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132601328962---kadan.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/memerejajirizenipogo.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://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_off0000bc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC03 10120 bytes
SHA-256: b80c54d46ecb537411d78d2c64660923b72d31664b68d0e9d59a1642c0a8b02f
font_01_sfnt_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 16996 bytes
SHA-256: 5da2f117ce233c79fb61e1c67c4a25fe97f98f2a24c725a782fbe543702350bf

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