Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ebf02f77b22458…

MALICIOUS

PDF

70.8 KB Created: 2021-09-17 00:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1cd909b77dc52831cec74276a3da728 SHA-1: 328dd0b705515b6a4de849ec505020b66cf6a96a SHA-256: 25ebf02f77b22458adf0842e62e9ad8ff59f420f08ada1d489be5b1f58b133a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing or malware delivery schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://inunekocp.jp/mailmagazine/upload/files/89921253578.pdf In PDF document text
    • http://gutachterbewertung.de/userfiles/file/ponasim.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/rarawiwesik.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/91196326540.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/bawobeletabok.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/wukozibajosifiga.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/14480175459.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/62812888132.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/14328253038.pdfIn PDF document text
    • http://naviway.su/upload/files/kazutejok.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/soragepamizam.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/57759018345.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d661bc8f8b---16441070090.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/kewivesokegiromoremakukoz.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/waruk.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/dukuvoleturerozojajemiv.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/gozexexetijiduwigubuj.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/navudunefe.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091605083373499.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/rirozon.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/vugajagekotete.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/22651120130.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30222150732.pdfIn PDF document text
    • https://preciseenergygroup.com/media/85800539297.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/84005412144.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/zivun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=can+my+phone+run+minecraftPDF 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_off0000b5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 15416 bytes
SHA-256: 975e26de456461dba2bf69784aa46f12b51b8811b598b1d85b0412234f54738d
font_02_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 10776 bytes
SHA-256: aedd20fc41837337286912bbe57db7a669e9cb5eea2f05f18758a00baa45834a