Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17143dea6f3343c…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 12:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee3f2bab3a6db262639c2cb7393b19a6 SHA-1: d45592ef124dba586712481b307fc1c7a4e401ab SHA-256: f17143dea6f3343cbee5bc260d818aeb4e061394f09342c19a1160368239361f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://archism.ru/uplcv?utm_term=how+to+restore+my+files+on+android PDF link annotation
    • https://maxflowfans.com/userfiles/file/14249486312.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/63526514772.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/wamuleradopolemuvimitasug.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/bivuduzuvi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613597737e383---naxikesolutubow.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907002808.pdfIn PDF document text
    • http://ucokampen.com/media/files/rominuzezimobilenu.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xesatizugavegek.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210913091625.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140be52bbb19---42120228081.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/tumasadesotijoto.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/xitarenozefus.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/dixobuwotesexozereruxaf.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219131924199472.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/filatenirodi.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/fapan.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/zaxosu.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/36429747940.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/89130629703.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/wiponagadisasuned.pdfIn PDF document text
    • https://ms01bet.net/contents/files/kegowupu.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/53445984316.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/madufawepiwuraxukov.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/50338182948.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/37731564865.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/20298067878.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_off0000c0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F6 10704 bytes
SHA-256: cb5fe6ad31987ab45388c30a2b16ebab30360fb6d5d8ad9495f0cb4de41d4a22
font_01_sfnt_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 17252 bytes
SHA-256: b0e4b1907be79c7105326871142c10d87973ac9d802be1b1aad1bb1dc4b24874
font_02_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1