Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b254c3a6b065630…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 20:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 398efc3d37dec1f2e8be10371be01eb8 SHA-1: 55765a18f5c088f7c78eecc1dfe9f7e1131722e2 SHA-256: 3b254c3a6b065630eac9a0531ee1c420c020d539d76903aa93a0ae9460909267
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 as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a probable phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=f9+full+movie+in+english PDF link annotation
    • http://vytvarnyobchod.cz/UserFiles/File/50820137744.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d24e36114c---fowozu.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/98732951885.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/2388388994.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/82214766748.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/jakoxiridiwimijoresulo.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixabiwopiwexuvoxol.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-9/20210909162248994996.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/41012570973.pdfIn PDF document text
    • http://freestyler.cz/img/file/nivolirore.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/wixemepotesasibunep.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/fudegigafalupodanasa.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630970530.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/kasidusogu.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/sajuni.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/37711469673.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mateje.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/zavaxoboru.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/78910315878.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/difiwo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hlsqig2cuut10jvkf7b92gb288/66356470415.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/84887449931.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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 10612 bytes
SHA-256: 8461fd2bd7214a682703b081a85eac13cf9f997e5875ee34c42eff651a3f2481
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 17952 bytes
SHA-256: e65d933f032338d4a1e934e65b6ff55bff2a5f3b87dfadcd7d0f10fe3e829c9c
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1