Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb806c621f042986…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 10:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51f740c2caf48b4c0827dff127c4b6a8 SHA-1: c112e9d938892a1467f05954df9f9c9de69032a8 SHA-256: fb806c621f042986e3ef4d6a68963f0ace7f400f0db535f3bdd1447790ec9dfd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL related to 'among us apk mod 2021', suggesting a lure for users to download potentially unwanted or malicious software. The presence of numerous embedded URLs pointing to various domains, many of which are associated with file uploads or plugins, further supports the attack pattern of hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8caa059f---sivopifika.pdf In PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/63978058355.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/12366761720.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/dozusolisi.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/92057209217.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/19405589559.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/61254893574.pdfIn PDF document text
    • http://opersan.com/file/kubefewapidi.pdfIn PDF document text
    • http://mqskin.com/luutru/files/fotonoziwete.pdfIn PDF document text
    • http://labotinnghia.com/img/files/pesoxititorif.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/79619005117.pdfIn PDF document text
    • http://apsons.eu/files/file/3757522173.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109042136217358.pdfIn PDF document text
    • http://panteres.com/files/files/99400259262.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1214081582613d82d70cfd8.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fidofiteputunobonun.pdfIn PDF document text
    • https://preciseenergygroup.com/media/81392695261.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-6/20210906053107640052.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/sojuxidetizu.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/labupakaxesawonawuduf.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/306998726.pdfIn PDF document text
    • http://qdcmd.com/data/files/45863626421.pdfIn PDF document text
    • http://hjhchem.com/upload/files/69354492791.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/m1mn5o3vje81u0pampfmunna74/kipanujafer.pdfIn macro / runtime command snippet
    • https://gangwontaxi.com/FileData/ckfinder/files/20210912_117EE86DA948105A.pdfIn PDF document text
    • http://hjhchem.com/uploadIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=among+us+apk+mod+2021PDF 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_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 10736 bytes
SHA-256: a3e25de8319300071b363de6774d0bbc7b1ae2f5167faec5a499086bf95f2838
font_02_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 17732 bytes
SHA-256: 5f7981c56a814d9b25e0bcb163ec5e2dbc4af77ea4a00fddec73ec371d572939

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