Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4b83781cd56997…

MALICIOUS

PDF

72.2 KB Created: 2021-10-03 12:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 011ebe955a2f54dd9e24a4945972329b SHA-1: 47d990a7761e289f7e59c55eff8b47577fe7ad90 SHA-256: 5b4b83781cd5699755eeb60d5adacf6edd8d2e4e518443b9dce12c433f1ee8db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to potentially disposable domains, suggests a phishing or credential harvesting campaign. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://indagosrl.it/userfiles/files/luvizipalasibuwonuwamixi.pdf In PDF document text
    • http://wingmanresearch.com/userfiles/files/loxonalufivudolasa.pdfIn PDF document text
    • http://didula.ru/img/file/wotinavolupijajatokaw.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/kosimuzamitifogu.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/zafusuzemadoba.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210920142244751338byoav1.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/12296944934.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/gopoxoresenupugopatiki.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210905_871050657C605CDF.pdfIn PDF document text
    • https://agrando.cz/files/file/41720524969.pdfIn PDF document text
    • http://imi.vc/upload/files/sasewusutebuzopezena.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/dopom.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/81147214199.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/tofezenoxigisoro.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a0068f96cef9f95cf7c46a2f30e4e3f3/tepularapozifukakisiva.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/48567541598.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/10050226626.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/dinulifusuxe.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/16586933464.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/45292563123.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/71555706169.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/tabifu.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/vedepugebimorojajosov.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/64700862791.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/84050739466.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/eb4a6a2ec7ab2abb82e00b1f0e65a69c/87483465308.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/zorisuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+was+the+philosophy+of+socratesPDF 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_off0000b71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71C 16420 bytes
SHA-256: 47008b53b067d2891bc87fc2d8bf972839158f486b6198da499d5d0c97cfb090
font_01_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 10664 bytes
SHA-256: 464201f1d61a01a05673a11eb0686684f544e0599e9509f91ce9a1e8791cf712