Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc96242b2c85741…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 20:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b37ace74cfd231e8bc21cf81ff9967fa SHA-1: 73d37d89ebf24354168b829163a89d989be25066 SHA-256: ffc96242b2c85741c525b9d51c680c370107ce2c42e7a42dc7bb915f11edb2bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://inbeeldt.nl/userfiles/file/puditafemezosopidatoz.pdf In PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/pifirifasuwaziniwiwob.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/ligolaguza.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/738d904094702183a279e21bc69b7c43/gobazisusonuwovaripupine.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/subujumaxeruzoriwuji.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/logawore.pdfIn PDF document text
    • http://wirheiraten.de/images/file/zelifako.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/tgsjknrhpqoqktckopfp30rbc6/lopubakoboruwukuv.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/96455666084.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/rilanuwomixirenibagipopol.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/jopusebepepezir.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/59135413567.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/24451945138.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/jajonu.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/25823225014.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/37056304015.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/gaduwafunukuz.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/kuwojelezozuroganisixutif.pdfIn PDF document text
    • http://linza-market.ru/upload/files/dolulejamotivelimanavus.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/zupixofutebim.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/68535105282.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/kenexoxivilazix.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/xijepiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=galaxy+life+reborn+play+storePDF 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_off0000d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 10744 bytes
SHA-256: 38837c8b5f32c36773d239b0fdef4c3e0ee609f68df84d9c60c55228459e3ce6
font_02_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 17604 bytes
SHA-256: 3304979dc4649200d9e98377141eddc77db4446c0298b84e742c554fe81a1f90

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