Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecb01476de065ef…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 11:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 35e6fbceb9dd39ff0fc489a6b8a04461 SHA-1: 42e0cff20e2a9e8918576029328e38a2fbaaf7d7 SHA-256: 9ecb01476de065ef6cfc930f4f2ebbe97ad8a6fc9dba5856ea53991ba88e5908
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=most+popular+game+in+the+world+on+mobile PDF link annotation
    • http://srtprogetti.eu/userfiles/files/51979025804.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/sabakivirizaxawuteledib.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/96222127726.pdfIn PDF document text
    • http://dobermanncz.eu/files/sajagivino.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4bb8837fd15a474f5c9c82fcff03d42/64432795644.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdff516785---52273817451.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/gigabuf.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/livik.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/80072755700.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuxovelilupepamifigonujur.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/68269552333.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/33298061866.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/wokilovepajatuzipepuvonox.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/fibebumafiduzo.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/miririnama.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/jababof.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/62742126058.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/biduj.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///domid.pdfIn PDF document text
    • https://sapporopools.com/contents/files/leduxaka.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/duganisijejajedamodexiw.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/vosifotijemuge.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/50530787790.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/26068170519.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_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 18128 bytes
SHA-256: 8b202e6d8ca5ca5645f1f06bae077c4161789bcdae5ab6ff168656da20d36425
font_01_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 11160 bytes
SHA-256: 21bad8857ce4a648d6f0bb5023ab80a5da4ee962bbbbe5663711edc879848943