Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcef576da9842d89…

MALICIOUS

PDF

85.2 KB Created: 2021-09-24 11:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88ac875367927f5ebbe31933ec3f28ee SHA-1: b455d710038c79d0a8991046ca1feaba9cd04273 SHA-256: dcef576da9842d895bae70e4bd47d2fbcb7b433b9be45d4bee213f984011b844
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=telugu+wap+net+full+movies+mp4+avi+3gp PDF link annotation
    • http://chronocertif.com/userfiles/file/61255755768.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eba6c63fb---patalerasuxafufa.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/refapemukevabejejere.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/kuverivujaxiwotagesanama.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/60300924707.pdfIn PDF document text
    • http://letdentalab.com/img/files/68410079395.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/kekekupibosuduvibide.pdfIn PDF document text
    • http://goodmax.ru/i/files/79265381525.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614490793642a---gisegodekiwejegotuluger.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161307419bdc93---pewefizaresovesiraxopisor.pdfIn PDF document text
    • http://stromzeleny.cz/file/mokivivuxa.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/losalibivijitutivazod.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/1611774088.pdfIn PDF document text
    • https://parc-hotel.info/file/21983141920.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/88757138686.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/80770770394.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210901232852_ldvb8p.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/botepoxu.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/69438955292.pdfIn PDF document text
    • https://oasis-travel.ro/files/falolodozenoxodutawon.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/93858769341.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/44176954031.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_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 21164 bytes
SHA-256: ba5210b0cf67545d508bd68b84040b31c883e89cd3da819b95b3d2cb2272a515
font_01_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE1 11068 bytes
SHA-256: 715a4d01d50c1495d2ebed41c06617cc1a5cad3b814899b0186f5bfa745736b1

Open this report in the interactive analyzer, or submit your own file for analysis.