Malicious PDF — malware analysis report

Static analysis result for SHA-256 1922f60d75d97d92…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 01:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 982d80e5c9b5437317252b7906acf874 SHA-1: 00440bba9ee2528da33b2123781884ea94d955cc SHA-256: 1922f60d75d97d920ecd225daaca7d994c24ae69a13deadecb620ca2d5820f7b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through a chain of links. The primary lure appears to be related to 'hack via sms'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=hack+via+sms PDF link annotation
    • http://greensquares.in/userfiles/file///marosiwenobatikokuduborul.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/munefoxomamazusa.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/nimotuko.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/41843909360.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/70052851439.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/rijekuvisenusedome.pdfIn PDF document text
    • http://serting.eu/userfiles/files/58133641805.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/rebotiziruzeta.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/bukeragufo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4c7qd2p4h9s0gei05p4q1psq40/95133489903.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/wewidosawikituk.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/57798575829.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/butijulefajekoveda.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/tonazamebalinezomigit.pdfIn PDF document text
    • https://unitjaya.com/contents/files/gebugi.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gaxewexem.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/17561918143.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/48634182957.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/41289978479.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/3682984124.pdfIn PDF document text
    • http://badgerhillfarm.uk/69989098241.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/xosumafexubopen.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/60811633769.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/28298537602.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/30981593194.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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 17032 bytes
SHA-256: 0d5ff77ff7da7550e83aeadd59e2438833eaac67e8a742ca6631a097489c2ef1
font_02_sfnt_off000120a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 9940 bytes
SHA-256: 3f82f9b7a1d0947913869ca7fc5f11dc2cb733e5c76df215742f21ebf72417fd

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