Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d58b009ab6c20b9…

MALICIOUS

PDF

69.1 KB Created: 2021-10-04 01:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9552a03ca358a42fa64b4f95cc40a3ca SHA-1: 0bb0fee9548ce33fe5025b453edc4757548c4b96 SHA-256: 1d58b009ab6c20b93b5b1a5a12681ad6d99fa21ef5628d39b56dad7e72362456
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and the embedded URLs strongly suggest it's designed to lead users to phishing or malware distribution pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dekoblickfang.de/userfiles/file/16630407445.pdf In PDF document text
    • https://pierreseche.fr/userfiles/file/21318128094.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/balabuwifirupadidovo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16142c3852c362---zotiteguj.pdfIn PDF document text
    • http://gptools.net/userfiles/file/javesifitaxevijelugixu.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/19540265933.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/dalipanewikagal.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/jabatotadaporaxib.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/bumodizawemakuwuwarozive.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/96060197987.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/wexitutibufedopez.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/zamilefipekemukiwabowon.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/kesaximakuv.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sewolevevebepoxefexuvevin.pdfIn PDF document text
    • http://unibox.lv/files/text/27690320132.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/deluwugudoperogusa.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/bokatawakalitu.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/71997560559.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/sanananuweduxejurowu.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/lajibepaza.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613304a99e26c---20767464177.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/relizopi.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/45129083626.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/wigonobelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ancient+african+tribesPDF 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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 10284 bytes
SHA-256: 5a61ff5da5dd0aee472c75c8697df43134d8c6b9cb188d89fcba6f0e30c026a3
font_02_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 14692 bytes
SHA-256: 0e597cad0a53922744d285bdd018844344d48419cb8c28cf3faae733bd8edba8