Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab53988e2fee35a0…

MALICIOUS

PDF

77.4 KB Created: 2021-09-14 09:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e22c4b9c98127ffa5064dfa44ce52130 SHA-1: 00c7b4c61f55be37122a5b289453f84016c6e105 SHA-256: ab53988e2fee35a0389aca3451bf38bc17f3d7065bdec462958701268cd1b289
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a high density of external links. The PDF document acts as a link farm, directing users to numerous domains, including suspicious ones like 'nomylo.ru' and 'angerdress.store', suggesting a phishing or malware distribution attempt. The embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=x+men+animated+characters PDF link annotation
    • http://angerdress.store/ckfinder/userfiles/files/91433193307.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/5950405487.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa1f6a581---fejubisujovitabun.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/71163445231.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/41439349071.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/46823870500.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/temovoxizotebabun.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/jajagimudepitetaxowigek.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/damepevadokuduw.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/mugapupu.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/8581146061.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/21722820256.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/viketu.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210902_12AC98F44615FB2D.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/31336481703.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/76709673300.pdfIn PDF document text
    • https://landi-bg.com/images/file/5587225408.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/xotug.pdfIn PDF document text
    • https://sitarasign.ir/data/file/boluvod.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/sivotuzewubopijagowo.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/keruda.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/nigogisozawegojevore.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/24186977299.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_off0000cba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 17400 bytes
SHA-256: d8c48003f6d9eed8f89500d6eb7ccd70684c9aa1de565c873c93bd806c8852ab
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 10476 bytes
SHA-256: 296608706bd6f294da203008c705195f7c5ee546f3245165eda8ee60b418a291