Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4394da345321c24…

MALICIOUS

PDF

95.1 KB Created: 2021-09-17 08:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1aa2e26457229467cd8e2a304b58497d SHA-1: 7a677ff920c22809ecb47025a04c977d24a4d37a SHA-256: f4394da345321c24e01c8742b816f35487381c5d23b282f2640b315bda46211c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=game+of+thrones+season+1+episode+2+watch+online PDF link annotation
    • http://dnepropress.net/files/file/danaminutekinorume.pdfIn PDF document text
    • http://ativn.com/upload/file/78527870720.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/verasasifawoxirevevekefe.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/15515586257.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/wuxavekutojepisumofuvuro.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6312ce3d82be917ff22a7f2f5e8b108/39086717612.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/48754058792.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210905030221.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/rizaxelexiwej.pdfIn PDF document text
    • http://topflexsports.com/uploads/pimudoviriwif.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/67473832901.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/62261915760.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/fovixarupolinilu.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0917/c91ff1d13d6291a7e5e9ec3d72a476f3.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/gamutodetas.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/juxazosatiguw.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/97897520447.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/64233900042.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/xejupiwoseminorosutini.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/piniwipajusebu.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/35612483707.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/daxomulonorenevoju.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/tujomesevefu.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/vikivazi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613075d98d81f---pibidijozuratuwo.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/xagig.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_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 19456 bytes
SHA-256: 4512b77b3ee4385e66ed3d314ce5ee39d76a95e9354ab09e4a684d7904e9ce83
font_01_sfnt_off00013c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C81 11180 bytes
SHA-256: d1d2328f971eb5e8085d7ce69c8e3e4b4c07ac52fc307ffad4c8c3a64016e15c
font_02_sfnt_off000156a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1