Malicious PDF — malware analysis report

Static analysis result for SHA-256 6385cf33493d7afb…

MALICIOUS

PDF

76.1 KB Created: 2021-09-16 14:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e7672059605b27d191244b79b4d1071 SHA-1: f34502e6f53e9576e385c142ae7db19f66184ba0 SHA-256: 6385cf33493d7afb39626d674dc7d958f22058d21f3057b6daaf22422ab85c46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high density of links on potentially disposable hosting, suggesting a tactic to obscure malicious destinations or distribute various lures. The presence of multiple unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mlsy.cz/images/file/files/pufunubirezoliza.pdf In PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/1433182808.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/tanefovemovi.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/91613262518.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210911_CBE7DCE53CF98A35.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/50629812230.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/nabuzobajoguvilinujomeme.pdfIn PDF document text
    • http://epicridesnepal.com/files/wilibofokixotiw.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/83302830029.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210901173008.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/81637666245.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/ramobinugukirerikap.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/dupuxemazudigibadaz.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-16/20210916105155666653.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/wapadozumovu.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/puwanabazazuzo.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/vorop.pdfIn PDF document text
    • http://sbairs.com/datas/files/54026287512.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/84623393575.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210909025614.pdfIn PDF document text
    • https://kapefashion.com/files/files/61259825201.pdfIn PDF document text
    • http://gr-chem.com/upload/files/texizujopuronufejoxefi.pdfIn PDF document text
    • http://csp.hu/editor_up/xoxotuvurakinubufim.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428e2131708---50694710169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=minecraft+pocket+edition+apk+obbPDF 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_off0000c63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63C 10624 bytes
SHA-256: c9d992f1e8f38e4857a158832d675f2561dac0c3acc5106a2658cb95ad742cbb
font_01_sfnt_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 17056 bytes
SHA-256: 17abe22da4aa38db67675a84b44b5d408349c56b4d01ac0bc78401cad6d081e8
font_02_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1