Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8b3d530bea598c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 14:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51a085234540cb18690535821addf70d SHA-1: 78c081abaf5ac6afa1a5b994d3c8ac3114cbe3a5 SHA-256: ba8b3d530bea598c5ae9422c6b607433b5b9003916852ac827a266075a769ac6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a likely attempt to direct users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

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://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xozetevi.pdf In PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7f13b840---50384439297.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/zezivezaliliwusatokit.pdfIn PDF document text
    • https://grandegroup.net/files/wenibubotow.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/58934256116.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/bojujonijurumax.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/26878077518.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/lumigaxomemizik.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/24115611788.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/64722792487.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210905/file/76953247756.pdfIn PDF document text
    • http://baove24h.org/upload/files/98805756859.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/65023343960.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/xisuj.pdfIn PDF document text
    • https://yodobashi-church.com/pebitugesiwusotinipeboset.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c1d319064---39962755379.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/xozogemefilifobi.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/27499353490.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/bimawolipar.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/57661972113.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/walubefoz.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/63239295908.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/jinof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+ready+to+love+season+1+online+freePDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/87912206553.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_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 17052 bytes
SHA-256: 6320d9d5af82d4add55537554a65366875956345172440bbec6c3549e5c26f76
font_01_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001149b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 10796 bytes
SHA-256: f81cb12c3bdb05b29c8610d0c85fec41a2015592345a1695e5e6bafae88659dd