Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5114e6e92c2061…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 07:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f2220472ac2487ee4dcd2672f0fcc160 SHA-1: 8ba7c604d9b00610f01c67f91e14ebde5f1bddb8 SHA-256: bb5114e6e92c2061dd9cb8519fb6984dbf5c70d68d37417459f97ce959ddeb60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic findings point to the document acting as a link farm, with numerous external URIs, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8aa4723a---58790744410.pdf In PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/tewidoxijinonafozafafefe.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/7493458759.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/nijuloxageli.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/60800397884.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/xaligowuk.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/93779084218.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/tasaweju.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd3f862b9---fabufofujiliwu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lugagafuni.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/mawonutamudexogu.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/ritivivekipije.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/24744802636.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/xujolozadosovule.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/23642182772.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/9339857932.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/51907079590.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/5642710474.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/ximijesodolexobidal.pdfIn PDF document text
    • http://abwessex.com/uploads/files/kabiperigutifefasem.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/52001499509.pdfIn PDF document text
    • http://lblussana.it/images/file/73231017354.pdfIn PDF document text
    • https://upaspor.com/resimler/files/tirafomotajimipidefurorip.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/namitovalidaradozokatur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+firestick+remote+apkPDF 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_off0000c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 18608 bytes
SHA-256: 3276eeab91b54e7be980d81223b8119721a656cd400a89b73229517fa5ca509c
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 10960 bytes
SHA-256: 9fbb7bbe24e58470eaec4dc512d5c3dce308f9a22322b58aad7d543cdac45323