Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8416c45ee77010…

MALICIOUS

PDF

86.7 KB Created: 2021-09-23 08:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 34d97e61f1ab967edbcda9d07706d8d3 SHA-1: 39ed83e57c29b5a2391f180510064737d1bab8a7 SHA-256: 9b8416c45ee770109431e971442d374020354e7db4cbdf67ed756d47e1ee3453
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a3968ad90040e9d5bcd3f24fad71ffa5/suvadiwuzutijabupe.pdf In PDF document text
    • http://thy-environment.com/userfiles/files/13228990801.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f521d243a68aa2b528d526c9c3b485ce/89894265279.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/57475127641.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/70224372694.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/mipexepod.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/powemurari.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/dinajalejenasone.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/25374518595.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/53922476657.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/5696963446.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/sabalebuvabut.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/fipizalisapawotup.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/lojebamomamutofiwete.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/15017690677.pdfIn PDF document text
    • http://budka39.ru/files/liradakuvurosulubega.pdfIn PDF document text
    • https://dm288.rs/slicice/file/gawuwulapuguwix.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/27827316292.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/vudipego.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/fupakozoribo.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/gidimiwegemipinogotubaj.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/59116617741.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/gegixenis.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/zelalufaxuv.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/65310539959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ludo+club+mod+apk+unlimited+money+download+android+1PDF 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_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 19184 bytes
SHA-256: db7d96fc44c6a96c3c1011be235e79c58732c464d3196ff9648661ac9a6822f0
font_01_sfnt_off000118ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118ED 11048 bytes
SHA-256: cbc79bba9d27652dc3741daf7a101013e533ed28d17d4224825c830406f820bb
font_02_sfnt_off00013280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1