Malicious PDF — malware analysis report

Static analysis result for SHA-256 0239442107299662…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 13:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 010557846b59f9dd4245a0cc73512360 SHA-1: d5cfc61fd6f097e9d0f591e72feda4d7b452f592 SHA-256: 0239442107299662ef4ff9d18ffc5c5aa69b8b455e409a99c0b4199e6d6ac605
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a likely attempt to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, identifying the document's structure as a non-clustered link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=fps+online+strike+mod+apk PDF link annotation
    • http://svenskafik.se/uploads/fckeditor/file/subor.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/kakaturogipow.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/47445923197.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/ziwuwodumosojava.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210905032652.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/wazizigode.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/dukonoteribozugosuvoka.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/13108933658.pdfIn PDF document text
    • http://sparkpro.lv/content/file/33457309503.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/91060055749.pdfIn PDF document text
    • https://kimcert.com/E/file/gituselawed.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/77082348712.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/95246235656.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc6306239---68368658008.pdfIn PDF document text
    • http://tcihk.com/userfiles/61550092120.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82dcead4d---fogekomodijifomur.pdfIn PDF document text
    • http://apicn.net/upload/files/jafizi.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/44258687951.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/80790642866.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/21784820808.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/wuzejiw.pdfIn PDF document text
    • http://cloverdiamond.com/file/wuxuzavo.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/foxatobesepofupimadaj.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/74000348232.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/juvolas.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_off0000c2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 18932 bytes
SHA-256: 33b254afe5385850bfab28d065402ae7359bf509352c3438c7380ce0a7910c85
font_02_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 10624 bytes
SHA-256: edc74d4f9c403cd1df6f51cb461a5882d6cd39a9ef06e4475444b7b54fe35967

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