Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc3a26e4a44a2d2…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 19:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39436d954ae0c23d7ecb9cea8ac8206d SHA-1: 7b07a5024f2193d90d89b1a8db6393cd48b20ddb SHA-256: 1bc3a26e4a44a2d24e6d200004f53131bc92771c366f8db6ff014cc8acbc3a0a
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to download and execute a secondary payload. The heuristic 'SE_CLOUD_DOC_LURE' suggests a social engineering tactic impersonating cloud services to trick users into interacting with the malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://cructi.ru/uplcv?utm_term=100gb+free+cloud+storage+apk PDF link annotation
    • http://fruhmann-elektrotechnik.at/karoregubifulujeguna.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/88993669064.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/demokamitagawaleliforu.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/munabefasase.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/88899579079.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/16543611850.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/40508204458.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/nilipafirekigujifo.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/57588054374.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/nanatonufug.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/gozodobabekifabonamat.pdfIn PDF document text
    • https://jin-ji.com/upload/files/kasib.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/jesakidawe.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/xosuxeganekewubevak.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/kanalikosipixizev.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/virel.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/22784019132.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/nujupenixakujuz.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109050909425933.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/zojavezoluxixamex.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e76949c31---voxejivaredufapukugulopa.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/44347815583.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/38408262594.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/dunut.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/27024306346.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_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 17952 bytes
SHA-256: a2963b18481e4a59dd7d5911dc8652c9173b167d01cede1601773c6ca01c0d1c
font_01_sfnt_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 11008 bytes
SHA-256: 3e3205fbef6313fe4de00a9084abf01e505b401d5162dfa4f82fe37ea2fa8007
font_02_sfnt_off000134b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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