Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c114655d4d3da1…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 16:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0aeef27e80fe73d32b954a6ccaff68fb SHA-1: c7ab9d5a5ae3eb45390ccef8fda1bb0bcb5c439b SHA-256: e9c114655d4d3da1ebd711ecb15d88f4fa7783e90bf60e2f08ba782edc8b2e4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The heuristic analysis identified the document as a link farm, containing numerous embedded URLs pointing to potentially malicious sites. The primary attack pattern involves directing users to these external resources, which is consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://svarovanijelinek.cz/ckfinder/userfiles/files/30893549424.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161356e521c5da---kelogutajugabufukaxe.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/5c679b4a45d7e18d00a9a974fc63006c/sowefelilofawilage.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/16219441812.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/wopimuvupokozisi.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/wezelip.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/27190982498.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/peladapavefepegaba.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wakabufav.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/bivixesepusuxasijemon.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109030652012390.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/71422053493.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/39586892536.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/92024269359.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/lopavusobodak.pdfIn PDF document text
    • https://wittnebel.dk/file/3651794174.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/57597653104.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/35461737882.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/46593160500.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/xakunonulukewe.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/30381905617.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/lodavikikewojinifozij.pdfIn PDF document text
    • http://i-dron.cz/data/file/zetivabovenefamusulop.pdfIn PDF document text
    • http://gysanya.com/upload/file/210901153415256447x111cdhiicox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=transfer+android+to+iphone+12PDF 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_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 10684 bytes
SHA-256: 42d924e11ef07dcf32531e1e37738933decc955921956d6e52fd9deeb7ba5b71
font_01_sfnt_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 17680 bytes
SHA-256: 9d7bf4ab70466cb0bb1eda4e48edb09d01dce77cef4497810624088265125701
font_02_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1