Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef71b1c257a4a69…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 07:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30ea592c9431669864e43c90bb6a80e0 SHA-1: d2a16f5f0891fe8385102d5af8adeedbbd2edb12 SHA-256: fef71b1c257a4a69845e8be0557a966c4e736bb6588072ce1a082105bf1075b9
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous links to disposable domains and a deceptive call-to-action button suggests a phishing attempt designed to trick users into downloading a payload. The embedded URLs point to various PDF files hosted on potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://apartmany.cucoriedka.sk/data/files/pemanamosewedefu.pdf In PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/83769801706.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/luvipumabute.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/26924053354.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/9493698001.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61438da50ad1f.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/dovofozoxezewedunu.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///bixidekulujirezatis.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86476854407.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/18240315385.pdfIn PDF document text
    • http://www.moyekolodin.com/files/57759717740.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/67370280160.pdfIn PDF document text
    • http://rotang.net/userfiles/file/54055645081.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c803ca032ea9779e6269a3e9731dc4b6/jexovijolubejadudik.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/verofavapagewaregetabopo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/64f28eae9fe3fbe6c143d40a3877ab87/gitojifogepotazaxo.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/11909812275.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/buzegadolejibajo.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/suvirafikixizexeteva.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/93885479174.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/xekuwo.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/58478324683.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/mavufub.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/kotofuwodapivetakarob.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613995742b4fc---89137859273.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/35243686998.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/27128459370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=x92+firmware+updatePDF 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_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 10704 bytes
SHA-256: 6e2c015493abde3e6655786183487f7a823b69f76f2ffad9895c5da746d42b5b
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 18648 bytes
SHA-256: 82bb2c64466c1602e8219e6eade8f4f971e3bb542552cc47d24fca379c80db48
font_02_sfnt_off00012375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1