Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bb55e901c382e0…

MALICIOUS

PDF

106.2 KB Created: 2021-09-16 14:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e1db38e44f8bb6f12922ee9d891d89b3 SHA-1: f30fe77d67b313c3a85f265e73552cba7b581e80 SHA-256: 23bb55e901c382e00ecc73eacd919e2ab0f95baf08e116333214d302dfbe1e5d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://infrive.ru/uplcv?utm_term=market+leader+upper+intermediate+download PDF link annotation
    • https://unitjaya.com/contents/files/53369053222.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/64305055650.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/sukogogaboj.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/kokugafewerosaj.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/fupirugopafizejotud.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/96470613325.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/61714189831.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/basugoduzedi.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/13790163828.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/f46pk8hnmk3bmo785n3lirqlb2/72327325613.pdfIn PDF document text
    • https://togeltop.net/contents/files/88906246226.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/kivasapexefaziboxajujevi.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/25982883296.pdfIn PDF document text
    • http://strandedtattoo.com/file/xozilalagexikisotebado.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/809ee6028cd833a74be9fe62a7c34d9e/22607576866.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/rojoziwulikimuridotozudu.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/zodunolopokuve.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/dagekijaginexorukodegat.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/59142631855.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/dedumi.pdfIn PDF document text
    • http://terminsk.by/pics/files/kolinatudofitezuvuxopek.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/tolife.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/buguzowizusadugenawefobeb.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_off00013755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F67 19472 bytes
SHA-256: 784567442b8b08bb7a9bd0b897b0e560052cdfff7dce0fa3ff67ece90d46ec01
font_02_sfnt_off000182bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182BC 10656 bytes
SHA-256: 5243eb9d6d2e372fb554ac28e302b2ced293846bf7b854bcf54e36cbecfcd2e5

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