Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec71b79812e860e…

MALICIOUS

PDF

90.4 KB Created: 2021-09-16 15:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4407058a49efe9c5d62bf03ecc8ccf6a SHA-1: fb7ace8e4a017690a763d5384bc59e7cc7549de9 SHA-256: 8ec71b79812e860e26590069896965a3b09df7ca4153ba4a9c7b22b05b3e8984
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and the link farm heuristic suggest the primary goal is to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=2bhk+3d+plan PDF link annotation
    • https://deesudcoolingtower.com/userfiles/file/betedel.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/58945546636.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/62674919749.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/resomabel.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/beb03a9e59454ee1353794d2242a2c3c/betasarevarixosokirozazug.pdfIn PDF document text
    • http://wmsone.com/eimages/file/nujoxubinonawomab.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1df729d28---54464293190.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/2138165622.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/gutagowab.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/60033657051.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/88223992315.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/gebotinirowebiburalumiwu.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/57922953256.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/1629730998.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/52194510279.pdfIn PDF document text
    • https://emmaushuis.org/pages/fexoliwewokijadupofamusit.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/68057139325.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/ginowitu.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/gapogopazurufadisupi.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/26065611379.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/tojix.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/bebifarum.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/29685623157.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_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10208 bytes
SHA-256: da91a1dc1292dd061dd9e71f69e0a1291e9557b1747b64d618a42e598729cab5
font_01_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 17732 bytes
SHA-256: 24c62fec9d84a79affa3e5e7051eec15246fa9c02d6fdf1059c10a72350ffdbf
font_02_sfnt_off00014483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1