Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4271313ba5826c2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 14:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4d8c573dcc07f5e6a731096abaa2be0 SHA-1: f828090693c0b731d6819a42a01c5c14fdbc9b23 SHA-256: e4271313ba5826c25feef4da30ab8048a61e93381c1384bf7f7dd1539d99ef8f
146 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URIs, with a high-risk heuristic flagging it as a link farm on disposable hosting, and another specifically noting a URI pointing to a raw IP address. These indicators suggest the document's primary purpose is to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wct.goldcrownresort.com/magazine_files/files/sezesagigow.pdf In PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/xatugiwa.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145af512bf38---dizekajos.pdfIn PDF document text
    • http://ridendo.cz/files/file/69206620830.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/74890635705.pdfIn PDF document text
    • http://allasclub.com/campannas/file/pugijugu.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/30764886054.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/budumokik.pdfIn PDF document text
    • http://www.og2c.com/images/file/90083200648.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/59270913574.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/kaxodukejoba.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366709d345f---55871807385.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/89435249072.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/tunanobubenepinibuwekotix.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/lesepaporoza.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/11937108447.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/maluvizelukonozidejeteked.pdfPDF link annotation
    • http://jiuxingchaoshi.com/uploads/file/161011192421.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/25628334511.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-15/20210915220745796664.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/4102873406.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/75646908555.pdfIn PDF document text
    • https://motoralbini.it/files/file/kirojoraje.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/sikadegik.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/55741195909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=edit+raw+photos+androidPDF 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_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 10380 bytes
SHA-256: 4a400d1012ebba6e14351a78bf076df6220d943326e916f3f1937dccc094b28d
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 16468 bytes
SHA-256: 16e23dd3be9bb97d0c9fe6f3e86d08628aab16c7f3f536a8f983329a5bb98f2e