Malicious PDF — malware analysis report

Static analysis result for SHA-256 c868145070a28754…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 09:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 17d50cd466f2bfe5982f39e9d661d93a SHA-1: 3d6b22bdcf11d4951f851ea286e120d203dc19ff SHA-256: c868145070a28754ff9a30e3ccf6bca863513bb975396bbfd0d14e473110e025
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://thangmayedex.com/webroot/img/files/96858521681.pdf In PDF document text
    • https://mikludava.lt/images/files/9072804506.pdfIn PDF document text
    • http://climtech.com/files/files/benibopixukupifuweninebe.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/pumokemumopavix.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_013603.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/pevevesik.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/gitefogijixi.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144d88ba846d---4027070345.pdfIn PDF document text
    • https://phm.vn/upload/files/34608629251.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/67599182080.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/82678903808.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/16432703521.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/67518048581.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/sibixakaworituninefagizo.pdfIn PDF document text
    • https://heyratacademy.ir/file/lewebomuwikebos.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/legapeguzokufar.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/50656284518.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/6857117017.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/savenami.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/zibakefagubijikosavofog.pdfIn PDF document text
    • http://tokado.ua/media/file/nofowodozodogegalon.pdfIn PDF document text
    • http://grancanariacomercio.com/documentos/file/54642749204.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/82633551766.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c603254b31---99903125991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=lord+of+the+flies+chapter+3+discussion+questionsPDF 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_off0000b1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C2 11092 bytes
SHA-256: 6e41304e0cfc3fde14186d2e1dde5dd2cf9c6d886958bba6baed83c1398abfb2
font_02_sfnt_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 15660 bytes
SHA-256: c2cb5330db3455eb16e8ae78cc3d751cde3ca556cc57dc65d8d997689f1453e0