Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff53f011712c65d1…

MALICIOUS

PDF

84.6 KB Created: 2021-09-24 02:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 394af5f580d971a6e7208976bd2f28e3 SHA-1: 377f86e211be07c6ce2c63013b60cac932f384ab SHA-256: ff53f011712c65d17d0653cad3af1368315817793620dc0073cd1e91141bc8f7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) and the nature of the file as a potential attachment (T1566.001) support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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 http://yuanhebiotech.com/upload/files/kizasidoxotuwo.pdf In PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/70715443901.pdfIn PDF document text
    • http://vanhacollection.com/images/files/rujubejawiniwipewul.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/21211179674.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/tumibamu.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/xelodarorobetewowoson.pdfIn PDF document text
    • http://skncn.com/u/files/ropakuroxafoxagal.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/67556901149.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/tuwigajutatukubolosa.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/85249965237.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/zetivanosezaduvodogumuz.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/bajomogasajaxajalimud.pdfIn PDF document text
    • https://rinducm1.com/contents/files/fowiwefuxa.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/42168983550.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/rumunoni.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/10563939640.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/riwizezofarixelu.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/zufoniriniwokatafunibomen.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/90662014812.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/92722150341.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/61738209041.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/kizojidepepomudamavigapi.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/79704682778.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/25815517049.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/gipexekub.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/vulatozum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gta+v+mobile+game+gta+v+mobile+gamePDF 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_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 17940 bytes
SHA-256: 6a74de961eaf1e5639fa36fbdf165dceca939da9e96fd41978a5a97ec3530190
font_01_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 10324 bytes
SHA-256: c1bf441ebb609c6067beb7c58324091ff985fd3102c0cbba219f4dc98e74d0d3
font_02_sfnt_off00012cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1