Malicious PDF — malware analysis report

Static analysis result for SHA-256 784647af4388a9f9…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 15:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 345f274e9cb28c177bcbfe49bc82e995 SHA-1: be824d6d21cc0740f76888861c7b6c3fb1b34a8d SHA-256: 784647af4388a9f9e59ef293b310058718d0632ddb02ee74d23ca0b8429cdb79
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The presence of embedded JavaScript and numerous external URIs pointing to disposable domains suggests an attempt to redirect users to malicious content or phishing sites. The 'SE_DOWNLOAD_BUTTON' heuristic further indicates a lure for downloading potentially unwanted or malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=drift+max+mod+apk+unlimited+money PDF link annotation
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/17143028620.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1f086b91---mimefonuxezodo.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/pukiburinebeketimid.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/banera.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/nefelurijitixosutenobixik.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/57934975273.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/91906995480.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/bevixoxopugi.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/80400011975.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/jurudoruzugowazavufus.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/5166733851.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161328c531df89---xuzavexitakulokojotekurez.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/mawewot.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/fixan.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/tadotoxuguvoxeluvufefi.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popegaduxudimurumesimap.pdfIn PDF document text
    • https://webrobogo.hu/kepek/gibugotinuran.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/dizewezepe.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/nanuxenuwer.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/33527753778.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/60051973623.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/74638122512.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_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 19072 bytes
SHA-256: b30f3e9df0757930e6ad93b98d49f5f78fa19232a320a3d6ad477a771cdedd05
font_01_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 10900 bytes
SHA-256: e0abd717aaba6ea1cf379291f80eb829188ec2350bab5f81b831fa86440c823f
font_02_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1