Malicious PDF — malware analysis report

Static analysis result for SHA-256 da689814a5221be9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 13:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57302fd70f74e1db1bc5b7161fa06912 SHA-1: 9a47288e2864a29700a44ca1d1b9326a1e6b8b8b SHA-256: da689814a5221be907ffbee3d9b22726913e0761528e58c7f4a6ff9d0e8555a6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs, with a critical finding being a direct link to an IP address, suggesting an attempt to bypass domain-based defenses and directly serve a payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that this document is part of a malicious infrastructure designed to host or redirect to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ice-group.pl/userfiles/file/24835661155.pdf In PDF document text
    • https://maria-galland.ru/files/file/kozokifibizeba.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/51963875212.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210911_CE2485429F0E85F7.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/74609350470.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/levenevikomenok.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/45009374749.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/fuzir.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/lefezo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6ad0cb5bd4ca9c4a580a5024d003529b/11953683054.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/xaxuvagikaxajokiwometiw.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/bofimeliji.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/28745070402.pdfPDF link annotation
    • https://vieclamlaocai.vn/webroot/img/files/34124911025.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/wavaka.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/4967057017.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161313902d9e33---78121856136.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/82770056144.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/wekolakazolusitofojot.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jelutaluk.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/3815983066.pdfIn PDF document text
    • http://mega.kz/media/upload/files/95480282835.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/77465448381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=waze+tagalog+voice+translatorPDF link annotation
    • 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_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 10524 bytes
SHA-256: 2b1aa85ffa5767f0884f79c4951c83a6378718da0e9426e3b45e3fd29236a2d2
font_01_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 19856 bytes
SHA-256: 06a033317c137fbf12c74b392a848f87f0251ca8f1bd4f97c33c80ad1340b9ce
font_02_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1