Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6359522a5bf00f9…

MALICIOUS

PDF

74.1 KB Created: 2021-09-23 12:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d891d0cc1fbf8cccc6f2ca9ea4d27a6 SHA-1: 942cd532441f568d38b70a287b646ea1921932d8 SHA-256: d6359522a5bf00f91c640188f808aeb86c4409028c83be302b3fe066b33e31a9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying a link to an algorithmically-generated PDF on a suspicious domain. The ClamAV detection and ML classifier also indicate maliciousness. The presence of multiple external URIs and the 'link farm' heuristic suggest the primary goal is to redirect users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=scary+robber+game+download PDF link annotation
    • https://toyotaautobody.com/ckfinder/userfiles/files/koxud.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/giximuzesaluwutusowe.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/rusale.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/tuwusaraset.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/22312627989.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/wovaduravewes.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/taxujobiju.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d9b7n6ite6srs3s07akhppkr42/duwuzafuwizebasumafinod.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/pubujuteligalowafenakag.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/39383997096.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/wegagazedexasivamele.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/34133764883.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/93626247381.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/8896143589.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146dd9dcb2e2---66718251607.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/90421734668.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/melejewadu.pdfIn PDF document text
    • https://denimder.org/resimler/files/25079644433.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/38160855565.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/jojabokolurise.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/76097423632.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/16615034283.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/89187677652.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_off0000bedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDD 16828 bytes
SHA-256: 1000d70d5cb37d347128ab1e4a709db142167c845802eda2485cbce1cc50fc6b
font_01_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 10772 bytes
SHA-256: 71d446ef09804e0f182f9d7699a669c5cfda6f86e40e5153cd568855fa15912b
font_02_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1