Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a55bbfaf828fbf…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 13:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2399a6f2c97126612ff25dbf96b931c2 SHA-1: b1eaf1518812d082653543a111a8b8db5c4b31a9 SHA-256: f2a55bbfaf828fbf6f49c377f9b051897ffffcf8b4c43ab91b85d2aa2cb1e112
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that these links are used for malicious purposes, likely to redirect users to harmful content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=como+tirar+lag+de+jogos+android PDF link annotation
    • http://oilspecchem.com/files/wopuxop.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/18499223014.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/xaboxibujetitotuba.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/tovedapivuz.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161416d62eed20---sefanarigufil.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/41135807498.pdfIn PDF document text
    • http://live-net.it/file/67161774966.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/11176259736.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/wufeziwodigowetowaz.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/45457424515.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/zapalafuritadedo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/48964055619.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/56025567473.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/90203011021.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/nupavofo.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/pozetoga.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/94163449586.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/46466806401.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/28041979254.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/gekosepijuxuziralupikurax.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/tasaxuto.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/xupinuraxifilokujeduza.pdfIn PDF document text
    • http://idroter.org/userfiles/files/vazeke.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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 10752 bytes
SHA-256: d1f245004f710a4d4edbbc7176d6b196409e7f88d7b56e1873bc8bd3e5785f5f
font_01_sfnt_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 20416 bytes
SHA-256: 5b2369aa87eabdebea327e7a1b2a6fefad7e7b73ea3dea9bfcbe75d6c859d772
font_02_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1