Malicious PDF — malware analysis report

Static analysis result for SHA-256 490f33a26de99342…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 20:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 153e2a53d05ea81c743a197f60b4cc2e SHA-1: f26d37507b05d159587c5b5ebe3ba094c14fc756 SHA-256: 490f33a26de9934208fe7a7d922b068bd941c5d5d94696a22c4cdbeb33c70903
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links on disposable domains, likely to redirect users to malicious sites. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://aymfly.com/aym_image/files/89559418743.pdf In PDF document text
    • https://servicepapik.ro/files/fibanemij.pdfIn PDF document text
    • https://jin-ji.com/upload/files/butitobu.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/19246607919.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/r8jodi1le1gccmfmabus20n3hn/21101396194.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/69583449902.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091105004890.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/motorodewanimeko.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911222350807974.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16311395031143.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/gezokidibopuzulagivagitig.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/lvq28muf0hckb1le0s9vp3io0k/vikewuf.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/68714494019.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/tagilazidobut.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5663f0aae---nabumowexogira.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/76778141422.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/20128966557.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/45615655490.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/36325214418.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/majuxikabos.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/wifuloruzew.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/wusasazolojatigenovi.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/9278117099.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/58020680691.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/letewatenofamofubex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=games+like+marvel+contest+of+championsPDF 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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 10940 bytes
SHA-256: a94480ed4794ac18215444f144c17cb7909f4026781297ef51f3fb5debe49bf7
font_01_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 17320 bytes
SHA-256: be6cc797da8ba852db70c785f768a5cd37b8b40c2b8df20246f751f4c227535c
font_02_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1