Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39aedf8bb7005d0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 02:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3baf0cfe69c10d24f32c58dd676708a1 SHA-1: 3819e1e9b535df72b4d139848d14e5179cf9f2a3 SHA-256: f39aedf8bb7005d03f69dda3adfc2ddc104087478e7c813b711dcc9a9b9cb505
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a large number of embedded URLs, many of which point to link farms and disposable hosting, suggesting a phishing or malware distribution attempt. The authoring application 'wkhtmltopdf' is not typically associated with legitimate PDF creation, further increasing suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://krisoc.ru/uplcv?utm_term=free+download+ufo+vpn PDF link annotation
    • https://anakaygame.net/calisma2/files/uploads/jesuwofireko.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/gavisibobijesaxupojagovod.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/71739170134.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/wedobetiz.pdfIn PDF document text
    • https://onecre.com/images/content/files/gelidofesajorozerajigif.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/wozatexodovazazujigirobor.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/28162997665.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/86246197859.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/42288071476.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/berow.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/gadezepomadunoxejuroto.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/79350188916.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/82072948791.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/fasuwusamu.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/dudabiwabopurakag.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/78103718145.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b209b8d3---xuvomafir.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/zazubizoselo.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/59393529988.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/96083473669.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_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 18664 bytes
SHA-256: ab28b8821bdff40e9806c64d18db8ddf692f1b3ebf094514b52f1afa85879575
font_01_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 10360 bytes
SHA-256: 3afaf78615e7786400ac8bbd8757cb81f187d3f0dbb38dcca6bb4cb362ef5270
font_02_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.