Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a9879ce8576911…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 16:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2eba9334ba63041f521a52b06098878f SHA-1: 62692cf4b74d7edc43e94a119796a8a27a953499 SHA-256: d4a9879ce8576911686e98e7097a6180dea0a474afe8d3005d75db5f103c42a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://pixomot.ru/uplcv?utm_term=endocrine+organs+diagram PDF link annotation
    • http://www.fdconsult.qa/public/uploads/cms_files/jidutaseradogesowa.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/gagipodufotanulu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613335fa4c530---namuzegexaxowixuwat.pdfIn PDF document text
    • http://eichler-kammerer.de/kalufasijosajojufapago.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/94896343423.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a96f43474bf1122b0fd8d89dcb9894bd/lulekunogiwugifodogab.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/zidulosin.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/mokebinizesobigolexilita.pdfIn PDF document text
    • https://tele-video.ru/upload/files/nedatur.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/50611254072.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/fababajawuxupexuxojezokex.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/85879483373.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pomebenufilejobuwitot.pdfIn PDF document text
    • https://red-adlay.com/upload/files/26547649720.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210901125332.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/8879129894.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/mafosopeliwas.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/rubuvubameradadivizefuko.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/10270710766.pdfIn PDF document text
    • https://deepex.hu/hirek/files/xozuvatazekasenogiluw.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/23835863156.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/fisonusodigiripozewine.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/bapodoxugagoginodaxurafiz.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_off0000d0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 17124 bytes
SHA-256: 9538fcde53940aaa8ecad62aff353ba6448dc9d44d54f4ff16eeb5dc09d7a060
font_02_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 10552 bytes
SHA-256: c125ad8ef0c4bfc3e7fb79c1822699d1725770c0da315c14fc6aa798eb9a625e

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