Malicious PDF — malware analysis report

Static analysis result for SHA-256 351e31453dda48ab…

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 18:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e720ef873dabcbc41c85fec5e92f8ad3 SHA-1: f33b0b1b5adb21dfe86e923c5ba77bc95efeaaf7 SHA-256: 351e31453dda48abb6bb1e9b81af6291c178011b1f4ada9fffd3c4846de68af5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://sherwoodchambergolf.com/ckfinder/userfiles/files/96766750285.pdf In PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/lavefofimepev.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/83208440677.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/barobuma.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/57894232222.pdfIn PDF document text
    • http://popeyebio.com/upload/files/godunipen.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/12812592700.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/17681710815.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161302279ab9c1---80247576700.pdfIn PDF document text
    • http://gaudi.tw/upload/files/ludelaneneladitux.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/61770239468.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/xogivek.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/wonirawuxize.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/xuzigol.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/41231410805.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/taretujekufedatujede.pdfIn PDF document text
    • https://506hlapeta.com/files/file/41723791880.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161339a79d39d3---88615421024.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109061425363121.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/bejirarebedu.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/19576039223.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/xozejo.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/bosipanidapewiva.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/xabesusiber.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/57135953424.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/48551503968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nickelback+photograph+tabsPDF 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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 17632 bytes
SHA-256: 31f33b0a7587c972e1a994e17cbdc6c0fa420112e09ec6ee7e5581117106ea0a
font_01_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 10756 bytes
SHA-256: d177197e103a2db804d0c7d49eb21473a7b911a27becb49eb6bf672e00b76d43