Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb76d9931a374d1…

MALICIOUS

PDF

76.3 KB Created: 2021-09-15 14:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c3e079162dda27fc1d8638f40e2b23f SHA-1: 42980d91b1c5cc6068e4a8bc4ba74ca6b9feacd5 SHA-256: dfb76d9931a374d1f83d55a00d7c845e19869b42af1807a5fe509873814b15ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of disposable URLs, many of which are hosted on suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a second-stage payload. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fecoil.com/userfiles/file/16113374429.pdf In PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/45508054520.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/ribimajor.pdfIn PDF document text
    • http://momsystem.ru/public/file/dugosebopimuwejawukosa.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210914095102.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/parosovof.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/gozesilefokizesexina.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/48560208595.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/lezavigiwikimu.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/80741726552.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/2906586558.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/74111333308.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/71371625701.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/53969898950.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/rifen.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/kedonelikilorakof.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/83965155242.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/64848575001.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/xamilupumuwufugek.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/kugerijifiwesuzoduvemekod.pdfIn PDF document text
    • https://teamcode.net/upload/files/44504794897.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/25993948900.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/80733010859.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328733baea4---73461080451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+font+styles+for+androidPDF 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_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 10548 bytes
SHA-256: a7c8afbe72eac810b00347228476d24a182756c51944569d1c4497df455c46e4
font_01_sfnt_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 16632 bytes
SHA-256: 5e80c68d9c36f9f4738423dda788587a9c2b68a1ef23da7b61a8a3621a255ddf

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